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Stockholders' Equity - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 22, 2022 USD ($) $ / shares shares | Apr. 10, 2020 USD ($) | Jun. 30, 2021 USD ($) shares | Jun. 30, 2022 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) shares | Jun. 30, 2021 USD ($) shares | Jun. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) shares | Dec. 31, 2021 USD ($) $ / shares shares | May 31, 2021 $ / shares shares | Mar. 31, 2021 shares | Dec. 31, 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) |  |  |  | 100,000,000 |  |  | 100,000,000 |  | 100,000,000 |  |  |
Common stock, shares issued (in shares) |  |  |  | 32,596,403 |  |  | 32,596,403 |  | 28,705,334 |  |  |
Common stock, shares outstanding (in shares) |  |  |  | 32,596,403 |  |  | 32,596,403 |  | 28,705,334 |  |  |
Proceeds from common stock issued | $ |  |  |  |  |  |  | $ 47,153,000 | $ 3,431,000 |  |  |  |
Warrant liabilities fair value adjustment | $ |  |  |  | $ (9,682,000) |  | $ (15,271,000) | (19,712,000) | (16,567,000) |  |  |  |
Warrant liabilities | $ |  |  |  | 21,200,000 |  |  | $ 21,200,000 |  | $ 18,100,000 |  |  |
Debt instrument, description |  |  |  |  |  |  | 0 |  |  |  |  |
Face amount | $ |  |  |  | $ 36,383,000 |  |  | $ 36,383,000 |  |  |  |  |
Reclass of warrant liability to additional paid in capital | $ |  |  |  |  |  |  | $ 71,000 | 298,000 |  |  |  |
Second Tranche of Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount | $ |  |  | $ 10,000,000.0 |  |  | $ 10,000,000.0 |  | $ 10,000,000.0 |  |  |  |
Reclass of warrant liability to additional paid in capital | $ |  |  | $ 300,000 |  |  |  |  |  |  |  |  |
Third Tranche of Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount | $ |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |
Reclass of warrant liability to additional paid in capital | $ |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Sales Agreement |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued, net of expenses (in shares) |  |  |  |  |  | 96,668 |  | 96,668 |  |  |  |
Proceeds from common stock issued | $ |  |  |  |  |  | $ 800,000 |  | $ 800,000 |  |  |  |
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 |  |
Number of warrants issued to purchase common stock (in shares) |  |  |  |  |  |  |  |  |  | 113,607 |  |
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 |  |
Loan and Security Agreement | Second Tranche of Term Loan | Hercules Capital Inc. and Silicon Valley Bank |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  | 56,803 |  |  | 56,803 |  | 56,803 |  |  |  |
Loan and Security Agreement | Third Tranche of Term Loan | Hercules Capital Inc. and Silicon Valley Bank |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  | 28,409 |  |  |  |  |  |  |
Aspire Capital | Common Stock Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued, net of expenses (in shares) |  |  |  | 0 |  |  | 375,000 |  |  |  |  |
Proceeds from common stock issued | $ |  |  |  | $ 0 |  |  | $ 1,500,000 |  |  |  |  |
Cantor Fitzgerald & Co. and Ladenburg Thalmann & Co. Inc. | Sales Agreement |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued, net of expenses (in shares) |  |  |  | 0 |  |  | 137,610 |  |  |  |  |
Proceeds from common stock issued | $ |  |  |  | $ 0 |  |  | $ 700,000 |  |  |  |  |
Maximum | Aspire Capital | Common Stock Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock at sole discretion | $ |  | $ 20,000,000.0 |  |  |  |  | $ 0 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  | 23,147,552 | 32,596,403 | 29,221,158 | 23,147,552 | 32,596,403 | 23,147,552 | 28,705,334 |  | 20,625,637 | 19,663,698
Common stock issued, net of expenses (in shares) |  |  |  | 3,358,333 |  | 2,516,802 | 3,845,943 | 2,516,802 |  |  |  |
April 2022 Public Offering |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
Common stock issued, net of expenses (in shares) | 3,333,333 |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock issued | $ | $ 41,800,000 |  |  |  |  |  |  |  |  |  |  |
Warrant liabilities fair value adjustment | $ |  |  |  | $ 1,700,000 |  |  | $ 1,700,000 |  |  |  |  |
April 2022 Public Offering | Pre-funded Warrants |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued to purchase common stock (in shares) | 11,666,667 |  |  | 11,666,667 |  |  | 11,666,667 |  |  |  |  |
Public offering price | $ / shares | $ 2.999 |  |  |  |  |  |  |  |  |  |  |
April 2022 Public Offering | Series 2 Warrant |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 3.45 |  |  |  |  |  |  |  |  |  |  |
Warrant term | 7 years |  |  |  |  |  |  |  |  |  |  |
April 2022 Public Offering | Series 2 Warrant | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued to purchase common stock (in shares) | 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Number of shares received per warrant (in shares) | 15,000,000 |  |  |  |  |  |  |  |  |  |  |
April 2022 Public Offering | Series 1 Warrant |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
April 2022 Public Offering | Series 1 Warrant | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued to purchase common stock (in shares) | 11,666,667 |  |  |  |  |  |  |  |  |  |  |
April 2022 Public Offering | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalization Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public offering price | $ / shares | $ 3.00 |  |  |  |  |  |  |  |  |  |  |

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