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Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 16, 2020 shares | Apr. 10, 2020 USD ($) $ / shares shares | Sep. 30, 2016 $ / shares shares | Mar. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) | Dec. 31, 2020 $ / shares shares | Jul. 17, 2020 shares
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 |  | $ 0.001 |
Common stock, shares authorized (in shares) | shares | 250,000,000 |  |  | 100,000,000 |  | 100,000,000 | 100,000,000
Common stock, shares issued (in shares) | shares |  |  |  | 20,625,637 |  | 19,663,698 |
Common stock, shares outstanding (in shares) | shares |  |  |  | 20,625,637 |  | 19,663,698 |
Common stock, reverse stock split |  |  |  | 1-for-10 |  |  |
Common stock, reverse stock split ratio | 0.1 |  |  |  |  |  |
Proceeds from common stock issued | $ |  |  |  | $ 0 | $ 214 |  |
Derivative liability fair value adjustment | $ |  |  |  | (90) | 700 |  |
Warrant liabilities fair value adjustment | $ |  |  |  | 1,296 | 4,768 |  |
Warrant liabilities | $ |  |  |  | 49,900 | 51,200 |  |
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) | shares |  |  | 12,243 |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  | $ 36.754 |  |  |  |
Warrant expiration period |  |  | 5 years |  |  |  |
Senior Convertible Note Purchase Agreement | Other (Income) Expense |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |
Derivative liability fair value adjustment | $ |  |  |  | $ (100) | $ 700 |  |
Aspire Capital | Common Stock Purchase Agreement |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |
Number of purchase aggregate shares of common stock | shares |  | 1,956,547 |  |  |  |  |
Percentage of common stock outstanding |  | 19.99% |  |  |  |  |
Number of shares committed | shares |  | 70,910 |  |  |  |  |
Average purchase price of shares sold | $ / shares |  | $ 8.461 |  |  |  |  |
Percentage of common stock owned |  | 19.99% |  |  |  |  |
Aspire Capital | Common Stock Purchase Agreement | Maximum |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |
Sale of common stock at sole discretion | $ |  | $ 20,000 |  |  |  |  |

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