XML 65 R55.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Common Stock - Issued and Outstanding Shares - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  |  | 12 Months Ended | 40 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 27, 2021 | Dec. 07, 2020 | Aug. 06, 2020 | Jul. 01, 2020 | Apr. 28, 2020 | Mar. 12, 2020 | Dec. 17, 2019 | May 22, 2018 | Sep. 14, 2017 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Aug. 03, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |  | $ 0.001 |
Common stock, shares issued |  |  |  |  |  |  |  |  |  | 9,453,542 | 6,111,735 |  |  | 6,111,735 |
Preferred stock, par value |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |
Proceeds from exercise of warrants |  |  |  |  |  |  |  |  |  | $ 338,000 | $ 3,231,000 | $ 4,199,000 |  |  |
Shares issued |  |  |  |  |  |  |  |  |  | $ 41,000 |  |  |  |  |
Stock option exercises, Shares |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Restricted stock unit settlements |  |  |  |  |  |  |  |  |  | 231 | 236 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  | 5,114 |  |  |  |  |
Restricted stock unit settlements |  |  |  |  |  |  |  |  |  | 145 | 128 |  | 254 |  |
December 2019 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per unit of warrant |  |  |  |  |  |  | $ 6.60 |  |  |  |  |  |  |  |
Offering expenses |  |  |  |  |  |  |  |  |  |  | $ 34,000 |  |  |  |
Warrant exercisable period |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Cancellation of warrant description |  |  |  |  |  |  |  |  |  | Additionally, subject to certain exceptions, if, after December 17, 2019, (i) the volume weighted average price of the common stock for each of 30 consecutive trading days, or the 2019 Measurement Period, which 2019 Measurement Period commences on the closing date, exceeds 300% of the exercise price (subject to adjustments for stock splits, recapitalizations, stock dividends and similar transactions), (ii) the average daily trading volume for such 2019 Measurement Period exceeds $500,000 per trading day and (iii) certain other equity conditions are met, and subject to a beneficial ownership limitation, then we may call for cancellation of all or any portion of the warrants then outstanding. |  |  |  |  |
Number of required consecutive days weighted average trading price for cancelation or recall of warrants |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
Minimum required trading price percentage over exercise price for cancelation or recall of warrants |  |  |  |  |  |  | 300.00% |  |  |  |  |  |  |  |
Minimum required trading volume value per day for cancelation or recall of warrants |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |
Gross proceeds from sale of warrants and units |  |  |  |  |  |  |  |  |  | $ 13,800,000 |  |  |  |  |
Warrant and units offering cost including underwriting discounts and commissions |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |
Net proceeds from issuance of warrants and units |  |  |  |  |  |  |  |  |  | $ 12,300,000 |  |  |  |  |
Gross proceeds from issuance of common stock |  | $ 17,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  | 15,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting discounts and commissions and offering expenses |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
December 2019 Public Offering [Member] | Representative's Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issuable conversion of warrants |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, price per share |  | $ 8.75 |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to additional paid in capital |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercisable term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
December 2019 Public Offering [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per unit of warrant |  |  |  |  |  |  | $ 1.2 |  |  |  |  |  |  |  |
April 2020 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  | 280,782 |  |  |  |  |  |  |  |  |  |
Number of required consecutive days weighted average trading price for cancelation or recall of warrants |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |
Warrants to purchase shares of common stock |  |  |  |  | 0.75 |  |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock, offering price per share |  |  |  |  | $ 6.60 |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of warrants |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |
Percentage of exercise price exceeds in measurement period |  |  |  |  |  |  |  |  |  | 300.00% |  |  |  |  |
Average daily trading volume for measurement period |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  |  |  | $ 1,579,000 |  |  |  |
April 2020 Private Placement [Member] | Placement Agent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per unit of warrant |  |  |  |  | $ 7.59 |  |  |  |  |  |  |  |  |  |
Number of common shares issuable conversion of warrants |  |  |  |  | 25,270 |  |  |  |  |  |  |  |  |  |
April 2020 Private Placement [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  |  | 280,782 |  |  |  |
Shares issued |  |  |  |  |  |  |  |  |  |  | $ 6,000 |  |  |  |
July 2020 Registered Direct Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  | $ 6,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Placement agent fees and offering expenses |  |  |  | 700,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  | $ 5,300,000 |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  |  |  | $ 5,307,000 |  |  |  |
July 2020 Registered Direct Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  | 731,707 |  |  |  |  |  |  | 731,707 |  |  |  |
Common stock, price per share |  |  |  | $ 8.20 |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  |  |  | $ 15,000 |  |  |  |
August 2020 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  | $ 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | 6,800,000 |  |  |  |  |  |  |  | 6,822,000 |  |  |  |
Underwriting discounts and commissions and offering expenses |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  |  |  | $ 6,822,000 |  |  |  |
August 2020 Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  | 569,043 |  |  |  |  |  |  |  | 569,043 |  |  |  |
Common stock, price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.50
Shares issued |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Underwriters Over-Allotment Option Exercise [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 428,571 | 322,500 | 92,856 |  |  |  |  |  |  |  |  |  |  |  |
December 2020 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  | 15,789,000 |  |  |  |
Shares issued |  |  |  |  |  |  |  |  |  |  | $ 15,789,000 |  |  |  |
December 2020 Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  | 2,472,500 |  |  |  |  |  |  |  |  | 2,472,500 |  |  |  |
Common stock, price per share |  | $ 7.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |
May 2021 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ 23,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | 21,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting discounts and commissions and offering expenses | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
May 2021 Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 3,285,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, price per share | $ 7.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
At-the-Market Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  |
Common stock available for sale under offering |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 |  |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |  | $ 0.001 |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  | 0 |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |  | $ 0.001 |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  | 0 |
Series B Convertible Preferred Stock [Member] | December 2019 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares converted |  |  |  |  |  |  |  |  |  | 6,256 |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Series B Convertible Preferred Stock [Member] | December 2019 Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, shares issued upon conversion |  |  |  |  |  |  |  |  |  | 521,124 |  |  |  |  |
Subscription Agreements Executed on April 27, 2020 [Member] | April 2020 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per unit of warrant |  |  |  |  |  |  |  |  |  | $ 7.24 |  |  |  |  |
Subscription Agreements Executed on April 28, 2020 [Member] | April 2020 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per unit of warrant |  |  |  |  |  |  |  |  |  | $ 7.32 |  |  |  |  |
Class A Units [Member] | December 2019 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of new units in a public offering |  |  |  |  |  |  | 478,875 |  |  |  |  |  |  |  |
Public offering, price per unit |  |  |  |  |  |  | $ 12.00 |  |  |  |  |  |  |  |
Description of stock units issued |  |  |  |  |  |  |  |  |  | Each Class A Unit consisted of one share of our common stock and a warrant to purchase one share of common stock. |  |  |  |  |
Class B Units [Member] | December 2019 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of new units in a public offering |  |  |  |  |  |  | 6,256 |  |  |  |  |  |  |  |
Public offering, price per unit |  |  |  |  |  |  | $ 999.60 |  |  |  |  |  |  |  |
Description of stock units issued |  |  |  |  |  |  |  |  |  | Each Class B Unit consisted of one share of Series B Convertible Preferred Stock, par value $0.001 per share, convertible at any time at the holder’s option into 83 shares of common stock, and warrants to purchase 83 shares of common stock. |  |  |  |  |
Number of common shares issuable for each share of convertible preferred stock |  |  |  |  |  |  | 83 |  |  |  |  |  |  |  |
Number of common shares issuable conversion of warrants |  |  |  |  |  |  | 83 |  |  |  |  |  |  |  |
Class B Units [Member] | Series A Convertible Preferred Stock [Member] | December 2019 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |
Pre Funded Warrants | August 2020 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issuable conversion of warrants |  |  | 142,857 |  |  |  |  |  |  |  |  |  |  |  |
Pre-funded warrant, offering price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.499
Pre Funded Warrants | August 2020 Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per unit of warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001
Number of days of prior notice to achieve not in excess percentage of common stock shares owned by warrant holder |  |  | 61 days |  |  |  |  |  |  |  |  |  |  |  |
Pre Funded Warrants | August 2020 Public Offering [Member] | Maximum [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares of common stock owned by warrant holder |  |  | 19.99% |  |  |  |  |  |  |  |  |  |  |  |
Pre Funded Warrants | August 2020 Public Offering [Member] | Minimum [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares of common stock owned by warrant holder |  |  | 9.99% |  |  |  |  |  |  |  |  |  |  |  |
LPC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock value right to sell, maximum |  |  |  |  |  | $ 11,000,000.0 |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |
Minimum percentage of common stock shares outstanding authorized to sell |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |
Initial purchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,644 |
Common stock, shares issued |  |  |  |  |  |  |  |  | 617 |  |  |  |  |  |
Payments related to expense reimbursement |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 27,868 |
Gross proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,400,000 |
Offering expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |
Purchase agreement expired date |  |  |  |  |  |  |  |  |  | Mar. 14, 2022 |  |  |  |  |
LPC [Member] | Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, purchase price |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |
Additional common stock value right to sell, maximum |  |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  |
Additional purchase of common stock, maximum |  |  |  |  |  |  |  |  | 7,500 |  |  |  |  |  |
Offering expenses |  |  |  |  |  |  |  |  |  |  | $ 14,000 |  |  |  |
LPC [Member] | Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial purchase of common stock |  |  |  |  |  |  |  |  | 1,644 |  |  |  |  |  |
Common stock, purchase price |  |  |  |  |  |  |  |  | $ 608 |  |  |  |  |  |
Purchase agreement, description |  |  |  |  |  |  |  |  |  | Unit consisting of (a) one share of our common stock and (b) one warrant to purchase one-quarter of a share of common stock at an exercise price of $699.20 per share, or Warrant. Each Warrant became exercisable six months following the issuance date until the date that is five years and six months after the issuance date and is subject to customary adjustments. |  |  |  |  |
Exercise price per unit of warrant |  |  |  |  |  |  |  |  | $ 699.20 |  |  |  |  |  |
Initial purchase of units consisting of common stock and warrants issued |  |  |  |  |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |
LPC [Member] | Other Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Ladenburg Thalmann & Co. Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period granted for underwriting option |  |  |  |  |  |  | 45 days |  |  |  |  |  |  |  |
Ladenburg Thalmann & Co. Inc [Member] | 2019 Overallotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional purchase of common stock and warrants, maximum |  |  |  |  |  |  | 150,000 |  |  |  |  |  |  |  |
Overallotment option exercise date |  |  |  |  |  |  | Dec. 17, 2019 |  |  |  |  |  |  |  |

X
- Definition Average daily trading volume for measurement period. + References No definition available. + Details
Name: | achv_AverageDailyTradingVolumeForMeasurementPeriod
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Class of warrant or right cancellation description. + References No definition available. + Details
Name: | achv_ClassOfWarrantOrRightCancellationDescription
Namespace Prefix: | achv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Class of warrant or right exercise period. + References No definition available. + Details
Name: | achv_ClassOfWarrantOrRightExercisePeriod
Namespace Prefix: | achv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Common stock additional shares to be issued value authorized maximum. + References No definition available. + Details
Name: | achv_CommonStockAdditionalSharesToBeIssuedValueAuthorizedMaximum
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Common stock, shares available for future grant. + References No definition available. + Details
Name: | achv_CommonStockSharesAvailableForFutureGrant
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Gross proceeds from issuance of common stock. + References No definition available. + Details
Name: | achv_GrossProceedsFromIssuanceOfCommonStock
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gross proceeds from sale of warrants and units. + References No definition available. + Details
Name: | achv_GrossProceedsFromSaleOfWarrantsAndUnits
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum percentage of common stock shares outstanding authorized to sell. + References No definition available. + Details
Name: | achv_MinimumPercentageOfCommonStockSharesOutstandingAuthorizedToSell
Namespace Prefix: | achv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum required trading price percentage over exercise price for cancelation or recall of warrants. + References No definition available. + Details
Name: | achv_MinimumRequiredTradingPricePercentageOverExercisePriceForCancelationOrRecallOfWarrants
Namespace Prefix: | achv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum required trading volume value per day for cancelation or recall of warrants. + References No definition available. + Details
Name: | achv_MinimumRequiredTradingVolumeValuePerDayForCancelationOrRecallOfWarrants
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net proceeds from sale of warrants and units. + References No definition available. + Details
Name: | achv_NetProceedsFromSaleOfWarrantsAndUnits
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of days of prior notice to achieve not in excess percentage of common stock shares owned by warrant holder. + References No definition available. + Details
Name: | achv_NumberOfDaysOfPriorNoticeToAchieveNotInExcessPercentageOfCommonStockSharesOwnedByWarrantHolder
Namespace Prefix: | achv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of required consecutive days weighted average trading price for cancelation or recall of warrants. + References No definition available. + Details
Name: | achv_NumberOfRequiredConsecutiveDaysWeightedAverageTradingPriceForCancelationOrRecallOfWarrants
Namespace Prefix: | achv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Over allotment option exercise date. + References No definition available. + Details
Name: | achv_OverAllotmentOptionExerciseDate
Namespace Prefix: | achv_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payments related to expense reimbursement. + References No definition available. + Details
Name: | achv_PaymentsRelatedToExpenseReimbursement
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of exercise price exceeds in measurement period. + References No definition available. + Details
Name: | achv_PercentageOfExercisePriceExceedsInMeasurementPeriod
Namespace Prefix: | achv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of number of shares of common stock owned by warrant holder. + References No definition available. + Details
Name: | achv_PercentageOfNumberOfSharesOfCommonStockOwnedByWarrantHolder
Namespace Prefix: | achv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period granted for underwriting option. + References No definition available. + Details
Name: | achv_PeriodGrantedForUnderwritingOption
Namespace Prefix: | achv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Placement agent fees and offering expenses. + References No definition available. + Details
Name: | achv_PlacementAgentFeesAndOfferingExpenses
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pre-funded warrant offering price per share. + References No definition available. + Details
Name: | achv_PreFundedWarrantOfferingPricePerShare
Namespace Prefix: | achv_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proceeds from issuance of common stock gross. + References No definition available. + Details
Name: | achv_ProceedsFromIssuanceOfCommonStockGross
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Purchase agreement expired date. + References No definition available. + Details
Name: | achv_PurchaseAgreementExpiredDate
Namespace Prefix: | achv_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Purchase of stock number of shares purchased in transaction. + References No definition available. + Details
Name: | achv_PurchaseOfStockNumberOfSharesPurchasedInTransaction
Namespace Prefix: | achv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum number of common stock by which entity has the right to sell as per purchase agreement. + References No definition available. + Details
Name: | achv_RightToSellCommonStockSharesAsPerPurchaseAgreementMaximum
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sale of stock and warrants number of additional shares to be issued in transaction maximum. + References No definition available. + Details
Name: | achv_SaleOfStockAndWarrantsNumberOfAdditionalSharesToBeIssuedInTransactionMaximum
Namespace Prefix: | achv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sale of stock number of additional shares to be issued in transaction maximum. + References No definition available. + Details
Name: | achv_SaleOfStockNumberOfAdditionalSharesToBeIssuedInTransactionMaximum
Namespace Prefix: | achv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sale of stock price per unit. + References No definition available. + Details
Name: | achv_SaleOfStockPricePerUnit
Namespace Prefix: | achv_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Stock and warrants issued during period public offering. + References No definition available. + Details
Name: | achv_StockAndWarrantsIssuedDuringPeriodPublicOffering
Namespace Prefix: | achv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock and warrants issued during period shares warrants. + References No definition available. + Details
Name: | achv_StockAndWarrantsIssuedDuringPeriodSharesWarrants
Namespace Prefix: | achv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Stock units description. + References No definition available. + Details
Name: | achv_StockUnitsDescription
Namespace Prefix: | achv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Underwriting discounts and commissions and offering expenses. + References No definition available. + Details
Name: | achv_UnderwritingDiscountsAndCommissionsAndOfferingExpenses
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Warrant and units offering cost including underwriting discounts and commissions. + References No definition available. + Details
Name: | achv_WarrantAndUnitsOfferingCostIncludingUnderwritingDiscountsAndCommissions
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Warrant exercisable term. + References No definition available. + Details
Name: | achv_WarrantExercisableTerm
Namespace Prefix: | achv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrants to purchase shares of common stock. + References No definition available. + Details
Name: | achv_WarrantsToPurchaseSharesOfCommonStock
Namespace Prefix: | achv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrants to purchase shares of common stock offering price per share. + References No definition available. + Details
Name: | achv_WarrantsToPurchaseSharesOfCommonStockOfferingPricePerShare
Namespace Prefix: | achv_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of other increase (decrease) in additional paid in capital (APIC). + References No definition available. + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 + Details
Name: | us-gaap_ConversionOfStockSharesConverted1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 + Details
Name: | us-gaap_ConversionOfStockSharesIssued1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued for each share of convertible preferred stock that is converted. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496180-112644 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21506-112644 + Details
Name: | us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
Name: | us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_PreferredStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromWarrantExercises
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Description of stock transaction which may include details of the offering (IPO, private placement), a description of the stock sold, percentage of subsidiary's or equity investee's stock sold, a description of the investors and whether the stock was issued in a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569655-111683 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 + Details
Name: | us-gaap_SaleOfStockDescriptionOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
Name: | us-gaap_SharesIssuedPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=achv_DecemberTwoThousandNineteenPublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=achv_RepresentativesWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=achv_PlacementAgentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=achv_DirectOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=achv_AugustTwoThousandTwentyPublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=achv_DecemberTwoThousandTwentyPublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=achv_MayTwoThousandTwentyOnePublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=achv_AtMarketSalesAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=achv_SeriesAConvertiblePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=achv_SeriesBConvertiblePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=achv_SubscriptionAgreementsExecutedOnAprilTwentySevenTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=achv_SubscriptionAgreementsExecutedOnAprilTwentyEightTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_ClassAUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_ClassBUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_PreFundedWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=achv_LincolnParkCapitalFundLimitedLiabilityCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=achv_PurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_UnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_OtherWarrantSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=achv_LadenburgThalmannAndCoIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=achv_TwoThousandNineteenOverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |