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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2018
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 6,792 | $ 4,225 | $ 20,476 | $ 12,492 |  |
Incentive options, term |  |  | 10 years |  |  |
Stock options, outstanding | 658,600 | 723,914 | 658,600 | 723,914 | 696,711 |
Closing price of common stock | $ 288.99 |  | $ 288.99 |  |  |
Aggregate intrinsic value of stock options exercised |  |  | $ 14,500 | $ 30,700 |  |
Weighted average grant date fair value of share-based awards granted |  |  | $ 88.01 | $ 48.13 |  |
Total fair value of stock options vested |  |  | $ 2,600 | $ 2,600 |  |
Total unrecognized compensation cost | $ 61,300 |  | $ 61,300 |  |  |
Unrecognized compensation cost, weighted average remaining requisite service period |  |  | 3 years 29 days |  |  |
Number of unvested options and restricted stock units | 1,950,908 |  | 1,950,908 |  |  |
2018 Plan |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |
Common stock shares reserved for Issuance |  |  |  |  |  | 2,778,000
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 | 619,761 | 675,567 | 619,761 | 675,567 | 665,540 |
Closing price of common stock | $ 288.99 |  | $ 288.99 |  |  |
Aggregate intrinsic value of restricted stock units vested |  |  | $ 39,200 | $ 25,000 |  |
Weighted average grant date fair value of restricted stock units granted |  |  | $ 58.10 | $ 43.73 |  |
Total grant date fair value of restricted stock units vested |  |  | $ 10,800 | $ 9,800 |  |

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