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Stockholders' Equity - Additional Information (Detail) |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 16, 2020 shares | Apr. 10, 2020 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) shares | May 31, 2021 $ / shares shares | Dec. 31, 2020 USD ($) $ / 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 |  |  | $ 0.001 |
Common stock, shares authorized (in shares) | 250,000,000 |  | 100,000,000 |  | 100,000,000 |  |  | 100,000,000 | 100,000,000
Common stock, shares issued (in shares) |  |  | 23,885,570 |  | 23,885,570 |  |  | 19,663,698 |
Common stock, shares outstanding (in shares) |  |  | 23,885,570 |  | 23,885,570 |  |  | 19,663,698 |
Common stock, reverse stock split |  |  |  |  | 1-for-10 |  |  |  |
Common stock, reverse stock split ratio | 0.1 |  |  |  |  |  |  |  |
Proceeds from common stock issued | $ |  |  |  |  | $ 8,027,000 | $ 4,702,000 |  |  |
Warrant liabilities fair value adjustment | $ |  |  | $ 18,810,000 | $ 7,786,000 | 35,378,000 | $ 16,114,000 |  |  |
Warrant liabilities | $ |  |  | $ 15,300,000 |  | $ 15,300,000 |  |  | $ 51,200,000 |
December 2020 Public Offering Warrants |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |
Number of warrants exercised |  |  |  |  | 360,134 |  |  |  |
Proceeds from warrant exercised | $ |  |  |  |  | $ 2,600,000 |  |  |  |
Pre-funded Warrants |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |
Number of warrants exercised |  |  |  |  | 2,060,000 |  |  |  |
Proceeds from warrant exercised | $ |  |  |  |  | $ 2,000 |  |  |  |
Loan and Security Agreement | Hercules Capital Inc. and Silicon Valley Bank |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.001 |  |
Multiplier value by aggregate amount of the term loan advances divided by exercise price of warrants to calculate number of shares for purchase |  |  |  |  |  |  | 0.04 |  |
Number of warrants issued to purchase common stock (in shares) |  |  |  |  |  |  | 113,607 |  |
Aspire Capital | Common Stock Purchase Agreement |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |
Number of purchase aggregate shares of common stock |  | 1,956,547 |  |  |  |  |  |  |
Percentage of common stock outstanding |  | 19.99% |  |  |  |  |  |  |
Number of shares committed |  | 70,910 |  |  |  |  |  |  |
Average purchase price of shares sold | $ / shares |  | $ 8.461 |  |  |  |  |  |  |
Percentage of common stock owned |  | 19.99% |  |  |  |  |  |  |
Common stock issued, net of expenses (in shares) |  |  |  |  | 400,000 | 125,000 |  |  |
Proceeds from common stock issued | $ |  |  |  |  | $ 2,600,000 | $ 600,000 |  |  |
Aspire Capital | Common Stock Purchase Agreement | Maximum |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock at sole discretion | $ |  | $ 20,000,000.0 |  |  |  |  |  |  |
Cantor Fitzgerald & Co. and Ladenburg Thalmann & Co. Inc. | Sales Agreement |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock issued, net of expenses (in shares) |  |  |  |  | 430,605 |  |  |  |
Proceeds from common stock issued | $ |  |  |  |  | $ 2,500,000 |  |  |  |

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