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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2018
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 6,154 | $ 6,792 | $ 21,054 | $ 20,476 |  |
Incentive options, term |  |  | 10 years |  |  |
Stock options, outstanding | 603,939 | 658,600 | 603,939 | 658,600 | 625,107 |
Restricted stock units, outstanding | 532,256 |  | 532,256 |  | 606,685 |
Aggregate intrinsic value of stock options exercised |  |  | $ 9,800 | $ 14,500 |  |
Weighted average grant date fair value of share-based awards granted |  |  | $ 76.64 | $ 88.01 |  |
Total fair value of stock options vested |  |  | $ 3,100 | $ 2,600 |  |
Total unrecognized compensation cost | $ 63,900 |  | $ 63,900 |  |  |
Unrecognized compensation cost, weighted average remaining requisite service period |  |  | 2 years 11 months 4 days |  |  |
Number of unvested options and restricted stock units | 1,786,671 |  | 1,786,671 |  |  |
2018 Plan |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |
Common stock shares reserved for Issuance |  |  |  |  |  | 2,778,000
Incentive options, vesting period | 1,953,159 |  | 1,953,159 |  |  |
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 | 532,256 | 619,761 | 532,256 | 619,761 |  |
Closing price of common stock | $ 187.11 |  | $ 187.11 |  |  |
Aggregate intrinsic value of restricted stock units vested |  |  | $ 40,400 | $ 39,200 |  |
Weighted average grant date fair value of restricted stock units granted |  |  | $ 191.55 | $ 211.34 |  |
Total grant date fair value of restricted stock units vested |  |  | $ 19,700 | $ 10,800 |  |
RestrictedStockUnitsRSUMember |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |
Closing price of common stock | $ 187.11 |  | $ 187.11 |  |  |

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