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Stockholder's Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Sep. 14, 2018
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.001 |  | $ 0.001 |
Common stock, shares authorized (in shares) |  | 250,000,000 |  | 250,000,000 |
Common stock, shares issued (in shares) |  | 97,876,042 |  | 97,413,721 |
Common stock, shares outstanding (in shares) |  | 97,876,042 |  | 97,413,721 |
Derivative liability fair value adjustment |  | $ 700 | $ (3,425) |  |
Warrant liabilities fair value adjustment |  | (4,768) | 6,522 |  |
Warrant liabilities |  | 13,600 |  |  |
Number of warrants issued to purchase common stock (in shares) |  |  |  |  | 13,198,075
Warrants to purchase common stock associated with Loan Agreement |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |
Number of warrants issued to purchase common stock (in shares) | 122,435 |  |  |  |
Exercise price of warrants (in dollars per share) | $ 3.6754 |  |  |  |
Warrant expiration period | 5 years |  |  |  |
Senior Convertible Note Purchase Agreement | Other (Income) Expense |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |
Derivative liability fair value adjustment |  | $ 700 | $ 3,400 |  |

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