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Common Stock - Issued and Outstanding Shares - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended | 40 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 07, 2020 | Aug. 03, 2020 | Jul. 02, 2020 | Apr. 28, 2020 | Mar. 12, 2020 | Dec. 31, 2019 | Dec. 17, 2019 | Oct. 03, 2018 | Jun. 19, 2018 | Jun. 15, 2018 | May 22, 2018 | Sep. 14, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  | $ 0.001
Exercise price per unit of warrant |  |  |  |  |  |  |  |  | $ 80.00 |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  | 1,474,258 |  |  |  |  |  |  | 6,111,735 | 1,474,258 |  | 6,111,735
Preferred stock, par value |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  | $ 0.001
Warrant exercisable period |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Cancellation of warrant description |  |  |  |  |  |  |  |  |  |  |  |  | Additionally, subject to certain exceptions, if, after the June 19, 2018, (i) the volume weighted average price of our common stock for each of 30 consecutive trading days, or the 2018 Measurement Period, which 2018 Measurement Period commences on June 19, 2018, 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 2018 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 |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |
Net proceeds from issuance of warrants and units |  |  |  |  |  |  |  |  |  |  |  |  | 12,200,000 |  |  |
Proceeds from exercise of warrants |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,231,000 | $ 4,199,000 | $ 1,324,000 |
Stock option exercises, Shares |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Restricted stock unit settlements |  |  |  |  |  |  |  |  |  |  |  |  | 236 | 256 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit settlements |  |  |  |  |  |  |  |  |  |  |  |  | 128 | 254 | 267 |
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 |  |  |  |  | $ 5,600,000 |  |  |  |  |  |  |  |
Placement agent fees and offering expenses |  |  | 700,000 |  |  |  |  | 600,000 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 5,300,000 |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |
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 |  |  |  |  | 89,462 |  |  |  |  | 731,707 |  | 89,462 |
Common stock, price per share |  |  | $ 8.20 |  |  |  |  | $ 62.89 |  |  |  |  |  |  |  |
April 2020 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per unit of warrant |  |  |  |  |  |  |  | $ 62.89 |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  | 280,782 |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercisable period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Number of required consecutive days weighted average trading price for cancelation or recall of warrants |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |
Maximum number of common shares issuable per warrant upon conversion |  |  |  |  |  |  |  | 0.5 |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock |  |  |  | 0.75 |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock, offering price per share |  |  |  | $ 6.60 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
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 |  |  |
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] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per unit of warrant |  |  |  |  |  |  | $ 1.2 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriters Over-Allotment Option Exercise [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 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 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 0.001
Preferred stock, shares converted |  |  |  |  |  | 9,158 |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0 |  | 0
Series A Convertible Preferred Stock [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, shares issued upon conversion |  |  |  |  |  | 114,475 |  |  |  |  |  |  |  |  |  |
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 |  | $ 0.001
Preferred stock, shares outstanding |  |  |  |  |  | 1,121 |  |  |  |  |  |  | 0 | 1,121 |  | 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 |  |  | 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 |  |  | $ 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 |  |  | $ 7.32
Class A Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of new units in a public offering |  |  |  |  |  |  |  |  | 35,525 |  |  |  |  |  |  |
Public offering, price per unit |  |  |  |  |  |  |  |  | $ 80.00 |  |  |  |  |  |  |
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 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of new units in a public offering |  |  |  |  |  |  |  |  | 9,158 |  |  |  |  |  |  |
Public offering, price per unit |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Description of stock units issued |  |  |  |  |  |  |  |  |  |  |  |  | Each Class B Unit consisted of one share of Series A Convertible Preferred Stock, par value $0.001 per share, convertible at any time at the holder’s option into approximately 12 shares of common stock and warrants to purchase approximately 12 shares of common stock. |  |  |
Number of common shares issuable for each share of convertible preferred stock |  |  |  |  |  |  |  |  | 12 |  |  |  |  |  |  |
Number of common shares issuable conversion of warrants |  |  |  |  |  |  |  |  | 12 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |
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] | Common Stock [Member] | Maximum [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] | Common Stock [Member] | Minimum [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 |  |  |  |  |  |  |  |  |  |  |
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
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 |  |  |  |
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 |  |  |  |
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 |  |  | 45 days |  |  |  |  |  |
Ladenburg Thalmann & Co. Inc [Member] | 2018 Overallotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional purchase of common stock and warrants, maximum |  |  |  |  |  |  |  |  |  | 22,500 |  |  |  |  |  |
Overallotment option exercise date |  |  |  |  |  |  |  |  |  | Jun. 18, 2018 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |

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