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Warrants - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 23, 2017 shares | Sep. 29, 2017 USD ($) WarrantHolder shares | May 31, 2016 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Oct. 03, 2017 shares | Nov. 16, 2015 shares
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |
Fair value of shares sold with warrants | $ |  |  | $ 44,700 | $ 20,593 | $ 8,253 |  |
Exercise price of warrants | $ / shares |  |  | $ 7.50 | $ 13.05 |  |  |
Outstanding warrants |  |  |  | 32,000 |  |  | 32,000
Adjustment of warrant liability | $ |  | $ 1,900 |  | $ 1,880 |  |  |
Common Stock |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | 973,236 |  |  | 173,000 | 1,788,000 |  |
Shares issuable under warrants granted |  |  |  |  |  | 1,292,510 |
A Warrants |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |
Class of warrants expiration period upon issuance |  |  | 2 years |  |  |  |
B Warrants |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |
Class of warrants expiration period upon issuance |  |  | 30 months |  |  |  |
Warrants exercisable date |  |  | 2017-05 |  |  |  |
Warrant Exchange Agreement |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |
Number of warrant holders | WarrantHolder |  | 4 |  |  |  |  |
Outstanding warrants |  | 9,700,000 |  |  |  |  |
Maximum | A Warrants |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |
Warrants to purchase of common stock |  |  | 7,281,553 |  |  |  |
Maximum | B Warrants |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |
Warrants to purchase of common stock |  |  | 2,427,184 |  |  |  |
Registered Offering |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |
Number of shares sold in underwritten public offering |  |  | 9,708,737 |  |  |  |

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