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Equity Financing - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 16, 2022 USD ($) $ / shares | Aug. 31, 2022 USD ($) $ / shares shares | Jan. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Dec. 31, 2021 $ / shares | Jan. 28, 2021
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 |
Offering costs allocated to common stock warrant liability and expensed | $ |  |  |  |  |  |  |  |  | $ 314,000 | $ 0 | $ 314,000 | $ 769,000 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance, aggregate offering prices | $ |  |  |  |  |  |  |  |  |  |  | $ 50,000,000.0 |  |  |
March 2018 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  |  |  |  | 1,201,634 |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  |  |  |  |  | 1,282,832 |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  |  |  |  |  | $ 10.7258 |  |  |  |  |  |
August 2022 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  | 2,450,000 |  |  |  |  |  |  |  |  |  |  |  |
Offering closing period |  | Aug. 16, 2022 |  |  |  |  |  |  |  |  |  |  |  |
August 2022 Purchase Agreement [Member] | Pre Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  | 2,272,506 |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |
August 2022 Purchase Agreement [Member] | Preferred Investment Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  | 4,722,506 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price | $ / shares |  | $ 0.93376 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock pre-funded warrants and preferred investment options | $ |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiration period |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
December 2020 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  | 2,618,658 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants gross | $ |  |  |  | $ 8,000,000.0 |  |  |  |  |  |  |  |  |  |
Offering closing period |  |  |  | Dec. 22, 2020 |  |  |  |  |  |  |  |  |  |
December 2020 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  | 2,618,658 |  |  |  |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  | $ 3.00 |  |  |  |  |  |  |  |  |  |
Warrants expiration period |  |  |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |
September 2019 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  | 1,318,828 |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants gross | $ |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  |  |  |  |
Offering closing period |  |  |  |  | Sep. 05, 2019 |  |  |  |  |  |  |  |  |
September 2019 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  |  | 659,414 |  |  |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  |  | $ 7.52 |  |  |  |  |  |  |  |  |
Warrants expiration period |  |  |  |  | 5 years 6 months |  |  |  |  |  |  |  |  |
June 2019 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  |  | 1,489,575 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants gross | $ |  |  |  |  |  | $ 7,500,000 |  |  |  |  |  |  |  |
Offering closing period |  |  |  |  |  | Jun. 14, 2019 |  |  |  |  |  |  |  |
June 2019 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  |  |  | 1,489,575 |  |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  |  |  | $ 5.00 |  |  |  |  |  |  |  |
Warrants expiration period |  |  |  |  |  | 5 years 6 months |  |  |  |  |  |  |  |
June 2018 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  |  |  | 1,392,345 |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants gross | $ |  |  |  |  |  |  | $ 14,000,000.0 |  |  |  |  |  |  |
Offering closing period |  |  |  |  |  |  | Jun. 14, 2018 |  |  |  |  |  |  |
June 2018 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  |  |  |  | 1,392,345 |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  |  |  |  | $ 9.94 |  |  |  |  |  |  |
Warrants expiration period |  |  |  |  |  |  | 5 years 6 months |  |  |  |  |  |  |
June 2018 Placement Agent Warrants [Member] | June 2018 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  |  |  |  | 69,617 |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  |  |  |  | $ 12.568 |  |  |  |  |  |  |
Warrant, exercisable term |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
June 2019 Placement Agent Warrants [Member] | June 2019 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  |  |  | 74,479 |  |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  |  |  | $ 6.2938 |  |  |  |  |  |  |  |
Warrant, exercisable term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
September 2019 Placement Agent Warrants [Member] | September 2019 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  |  | 65,942 |  |  |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  |  | $ 9.4781 |  |  |  |  |  |  |  |  |
Warrant, exercisable term |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
August 2022 Options and August 2022 Placement Agent Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility | 128.46% |  |  |  |  |  |  |  |  |  |  |  |  |
Stock price | $ / shares | $ 0.94 |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate | 2.97% |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
August 2022 Placement Agent Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions, value | $ | $ 191,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Offering costs | $ | 488,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of common stock option liability expense | $ | 314,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining offering costs allocated to common stock and offset to additional paid in capital | $ | 365,000 |  |  |  |  |  |  |  |  |  |  |  |  |
August 2022 Placement Agent Options [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering costs | $ | $ 679,000 |  |  |  |  |  |  |  |  |  |  |  |  |
August 2022 Placement Agent Options [Member] | August 2022 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  | 236,125 |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  | $ 1.32 |  |  |  |  |  |  |  |  |  |  |  |
Warrant, exercisable term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
December 2020 Placement Agent Warrants [Member] | December 2020 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  | 130,933 |  |  |  |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  | $ 3.8188 |  |  |  |  |  |  |  |  |  |
Warrant, exercisable term |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
January 2021 Private Placement [Member] | January 2021 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  | 7,876,784 |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  | 3,938,392 |  |  |  |  |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  | $ 3.13 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants gross | $ |  |  | $ 25,100,000 |  |  |  |  |  |  |  |  |  |  |
Warrants expiration period |  |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |  |
Remaining offering costs allocated to common stock and offset to additional paid in capital | $ |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |
January 2021 Private Placement [Member] | January 2021 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering costs allocated to common stock warrant liability and expensed | $ |  |  | $ 769,000 |  |  |  |  |  |  |  |  |  |  |
January 2021 Private Placement [Member] | January 2021 Purchase Agreement [Member] | Warrants [Member] | Expected Volatility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred investment options liability, measurement input |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.238
January 2021 Private Placement [Member] | January 2021 Purchase Agreement [Member] | Warrants [Member] | Stock Price [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred investment options liability, measurement input |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.88
January 2021 Private Placement [Member] | January 2021 Purchase Agreement [Member] | Warrants [Member] | Risk-Free Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred investment options liability, measurement input |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5
January 2021 Private Placement [Member] | January 2021 Placement Agent Warrants [Member] | January 2021 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  | 393,839 |  |  |  |  |  |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  | $ 3.99 |  |  |  |  |  |  |  |  |  |  |
Offering costs | $ |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |
Warrant, exercisable term |  |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |  |
Issuance of placement agent warrants | $ |  |  | $ 942,000 |  |  |  |  |  |  |  |  |  |  |
January 2021 Private Placement [Member] | January 2021 Placement Agent Warrants [Member] | January 2021 Purchase Agreement [Member] | Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering costs | $ |  |  | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |
March 2018 Private Placement [Member] | March 2018 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  |  |  |  | 300,752 |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  |  |  |  |  | 300,752 |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  |  |  |  |  | $ 45.75 |  |  |  |  |  |
Proceeds from issuance of common stock and warrants gross | $ |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  |
Warrants expiration period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
March 2018 Private Placement [Member] | March 2018 Placement Agent Warrants [Member] | March 2018 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant issued, shares of common stock called by warrant |  |  |  |  |  |  |  | 15,038 |  |  |  |  |  |
Warrants issued, exercise price | $ / shares |  |  |  |  |  |  |  | $ 41.5625 |  |  |  |  |  |
Warrant, exercisable term |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |

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