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Common Stock - Additional Information 1 (Detail) - USD ($) |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 19, 2018 | Jun. 15, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Preferred stock, par value | $ 0.001 |  |  | $ 0.001 | $ 0.001
Warrant exercisable period |  | 5 years |  |  |
Exercise price per unit of warrant |  | $ 4.00 |  |  |
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 Measurement Period, which 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 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 units |  |  |  | $ 13,800 |
Warrant issuance costs |  |  |  | 1,600 |
Net proceeds from issuance of warrants |  |  |  | $ 12,200 |
Preferred stock, shares outstanding | 3,283 |  |  | 3,283 | 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] | Overallotment Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Additional purchase of common stock and warrants, maximum |  |  | 450,000 |  |
Overallotment option exercise date |  |  | Jun. 18, 2018 |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Preferred stock, shares converted | 6,627 |  |  |  |
Preferred stock, shares outstanding | 2,531 |  |  | 2,531 |
Series A Convertible Preferred Stock [Member] | Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Convertible preferred stock, shares issued upon conversion | 1,656,750 |  |  |  |
Class A Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Issuance of new units in a public offering |  | 710,500 |  |  |
Public offering, price per unit |  | $ 4.00 |  |  |
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 into 250 shares of common stock and warrants to purchase 250 shares of common stock. |
Number of common shares issuable for each share of convertible preferred stock |  | 250 |  |  |
Number of common shares issuable conversion of warrants |  | 250 |  |  |
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 |  |  |

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