Stock-based Compensation - Additional Information (Detail)
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12 Months Ended |
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Dec. 31, 2021
USD ($)
$ / shares
shares
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Dec. 31, 2020
USD ($)
$ / shares
shares
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Dec. 31, 2018
shares
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Oct. 15, 2020
shares
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Share based payment exercise price description |
The exercise price for incentive stock options is at least 100% of the fair market value on the date of grant for stockholders owning less than 10% of the voting power of all classes of stock, or at least 110% of the fair market value for stockholders owning more than 10% of the voting power of all classes of stock. Options generally expire in 10 years and vest over periods determined by the Board, generally 48 months.
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| Share based compensation expense | $ |
$ 13,457,000
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$ 2,975,000
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| Share based compensation expense recognized tax benefit | $ |
$ 0
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$ 0
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| Shares of common stock held by employees subject to repurchase |
163,855
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396,522
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| Aggregate price for share repurchase | $ |
$ 300,000
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$ 600,000
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| Less than 10% [Member] | Minimum [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Exercise price for incentive stock options as of fair market value |
1
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| More Than 10% [Member] | Maximum [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Exercise price for incentive stock options as of fair market value |
1.10
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| Stock Option [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Expiration period |
10 years
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| Common stock vesting period |
48 months
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| Share based compensation expense | $ |
$ 12,200,000
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$ 2,600,000
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| Share based payment unamortised share based payment expenses | $ |
$ 33,600,000
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| Share based payment expenses amortized over a weighted average period |
2 years 6 months 21 days
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| Share based payments weighted-average grant date fair value | $ / shares |
$ 13.76
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$ 7.50
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| Common stock issued upon exercise of stock options |
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371,939
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| Restricted Stock [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Expiration period |
3 years
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| Share based compensation expense | $ |
$ 357,000
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$ 361,000
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| Share based payment unamortised share based payment expenses | $ |
$ 95,000
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| Share based payment expenses amortized over a weighted average period |
3 months 18 days
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| Restricted stock awards rights vesting percentage |
33.00%
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| Restricted stock awards rights vesting |
1/36
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| Restricted stock awards granted |
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502,964
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| 2018 Equity incentive Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Share based payment Common stock shares authorised |
4,913,665
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| Share based payment awards granted |
4,279,693
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| Common stock available for future grant |
0
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| 2018 Equity incentive Plan [Member] | Restricted Stock [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Expiration period |
4 years
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| Restricted stock awards rights vesting percentage |
25.00%
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| Restricted stock awards rights vesting |
1/48
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| 2020 Incentive Award Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Share based payment awards granted |
3,867,000
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| Common stock available for future grant |
2,637,000
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| 2020 Employee Stock Purchase Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Common stock available for future grant |
45,610
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368,901
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| Share based compensation expense | $ |
$ 900,000
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