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Share-Based Payment Awards - Employee Stock Purchase Plan - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 25, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 22, 2021
Class Of Stock [Line Items] |  |  |  |
Employee stock purchase plan |  | $ 273,000 | $ 294,000 |
Common stock, shares issued |  | 33,905,826 | 18,139,981 |
Stock-based compensation expense |  | $ 7,447,000 | $ 5,547,000 |
ESPP [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Number of common stock, authorized for issuance | 110,000 |  |  | 250,000
Price of common stock purchased twice a year under ESPP, percent | 85.00% |  |  |
Employee stock purchase plan | $ 25,000 |  |  |
Employee stock purchase plan, shares | 5,000 |  |  |
Consecutive six month offering period | Aug. 01, 2019 |  |  |
Common stock, shares issued |  | 43,365 |  |
Stock-based compensation expense |  | $ 113,000 |  |

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