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Stockholders' Equity - Additional Information (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2018
Stockholders Equity Note Disclosure [Line Items] |  |  |  |
Stock-based compensation expense | $ 7,915,000 | $ 6,541,000 |  |
Incentive options, term | 10 years |  |  |
Stock options, outstanding | 650,059 |  | 625,107 |
Restricted stock units, outstanding | 591,377 |  | 606,685 |
Aggregate intrinsic value of stock options exercised | $ 1,400,000 | $ 2,500,000 |  |
Weighted average grant date fair value of share-based awards granted | $ 79.96 | $ 92.35 |  |
Total fair value of stock options vested | $ 2,000.0 | $ 1,900 |  |
Total unrecognized compensation cost | $ 77,400 |  |  |
Unrecognized compensation cost, weighted average remaining requisite service period | 3 years 1 month 20 days |  |  |
Number of unvested options and restricted stock units | 1,786,096 |  |  |
2018 Plan |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |
Common stock shares reserved for Issuance |  |  |  | 2,778,000
Incentive options, vesting period | 1,954,613 |  |  |
Employee Stock Option | Minimum |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |
Incentive options, vesting period | 3 years |  |  |
Employee Stock Option | Minimum | Vest Over Three Year |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |
Incentive options, vesting percentage | 20.00% |  |  |
Employee Stock Option | Maximum |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |
Incentive options, vesting period | 5 years |  |  |
Employee Stock Option | Maximum | Vest Over Three Year |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |
Incentive options, vesting percentage | 33.00% |  |  |
Non-Employee Directors |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |
Incentive options, vesting period | 9 years |  |  |
Unvested Options |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |
Incentive options, vesting period | 5 years |  |  |
Restricted Stock Units and Performance Stock Units |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |
Restricted stock units, outstanding | 591,377 |  |  |
Closing price of common stock | $ 188.09 |  |  |
Aggregate intrinsic value of restricted stock units vested | $ 30,200 | $ 27,100,000 |  |
Weighted average grant date fair value of restricted stock units granted | $ 196.36 | $ 209.13 |  |
Total grant date fair value of restricted stock units vested | $ 14,200 | $ 6,500 |  |
RestrictedStockUnitsRSUMember |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |
Closing price of common stock | $ 188.09 |  |  |

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