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Stock Option Plan - Additional information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 21, 2019 | Aug. 19, 2019 | Jul. 22, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | May 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding options issued |  |  |  | 10,665,869 | 6,840,719 |  | 5,842,879 |
Proceeds from stock options exercised |  |  |  | $ 1,036 | $ 442 |  |  |
Total intrinsic value of options |  |  |  | $ 800 | $ 300 |  |  |
Stock options, granted |  |  |  | 9,380,438 | 2,222,368 |  |  |
Stock options granted exercise price |  |  |  | $ 2.62 | $ 3.39 |  |  |
Options available for future grant |  |  |  | 30,564 |  |  |  |
Common stock, shares authorized |  |  |  | 350,000,000 | 250,000,000 |  |  |
Restricted Stock | Employees |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based payment award granted |  |  |  | 1,601,224 | 805,900 |  |  |
Unvested Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation costs related to non-vested restricted stock outstanding |  |  |  | $ 8,100 |  |  |  |
Expected recognition period |  |  |  | 2 years 1 month 6 days |  |  |  |
Unvested Restricted Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected recognition period |  |  |  | 2 years 1 month 24 days |  |  |  |
Share-based payment award granted |  |  |  | 1,601,224 | 805,900 |  |  |
Unrecognized stock-based compensation expense related to non-vested restricted stock arrangements |  |  |  | $ 2,100 |  |  |  |
the "2012 Plan" |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance |  |  |  |  |  |  |  | 14,000,000
the "2012 Plan" | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance |  |  |  | 2,847,190 |  |  |  |
Inducement Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding options issued |  |  |  | 32,500 |  |  |  |
Stock options, granted | 65,000 | 65,000 | 400,000 |  |  |  |  |
Stock options granted exercise price | $ 4.59 | $ 5.18 | $ 5.60 |  |  |  |  |
Share Based compensation arrangement by share based payment award options grants grant date fair value | $ 193,000 | $ 231,000 | $ 1,500 |  |  |  |  |
the "2020 Plan" |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 21,000,000 |  |
Options available for future grant |  |  |  | 1,066,275 |  | 22,066,275 |  |
Share Based Payment Award Shares Registered Due to Proximity On Authorized Shares |  |  |  | 5,750,000 |  |  |  |
the "2020 Plan" | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance |  |  |  | 7,818,679 |  |  |  |
the "2020 Plan" | Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding options issued |  |  |  | 9,208,236 |  |  |  |
the "2020 Plan" | Director | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding options issued |  |  |  | 1,397,633 |  |  |  |
the "2020 Plan" | Consultants | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding options issued |  |  |  | 60,000 |  |  |  |

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