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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 19, 2019 | May 03, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |
Common stock, shares issued | 1,587,000 | 3,144,531 | 52,052,581 |  | 52,052,581 |  | 43,917,378
Common stock issue price per share | $ 87.00 | $ 64.00 |  |  |  |  |
Exercised number of shares |  |  |  |  | 83,306 |  |
Net proceeds from public offering | $ 131,100 | $ 189,600 |  |  | $ 320,713 |  |
Stock-based compensation expense |  |  | $ 3,175 | $ 2,779 | $ 9,459 | $ 7,672 |
Stock options, outstanding |  |  | 959,916 |  | 959,916 |  | 998,226
Closing price of common stock |  |  | $ 76.69 |  | $ 76.69 |  |
Aggregate intrinsic value of stock options exercised |  |  |  |  | $ 5,200 | $ 3,500 |
Weighted average grant date fair value of share-based awards granted |  |  |  |  | $ 30.07 | $ 18.56 |
Total fair value of stock options vested |  |  |  |  | $ 2,900 | $ 2,100 |
Total unrecognized compensation cost |  |  | $ 37,700 |  | $ 37,700 |  |
Unrecognized compensation cost, weighted average remaining requisite service period |  |  |  |  | 4 years 1 month 17 days |  |
Number of unvested options and restricted stock units |  |  | 1,676,976 |  | 1,676,976 |  |
2018 Plan |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |
Common stock shares reserved for Issuance |  |  |  |  |  |  | 2,778,000
Incentive options, vesting period |  |  | 2,571,611 |  | 2,571,611 |  |
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 |  |
Incentive options, term |  |  |  |  | 10 years |  |
Employee Stock Option | Maximum | Vest Over Five 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 |  |  |  |  | 1 year |  |
Option To Purchase Common Stock |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |
Stock options, outstanding |  |  | 959,916 | 1,033,312 | 959,916 | 1,033,312 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |
Restricted stock units, outstanding |  |  | 740,213 | 707,716 | 740,213 | 707,716 | 707,413
Closing price of common stock |  |  | $ 76.69 |  | $ 76.69 |  |
Aggregate intrinsic value of restricted stock units vested |  |  |  |  | $ 15,500 | $ 5,200 |
Weighted average grant date fair value of restricted stock units granted |  |  |  |  | $ 33.46 | $ 30.21 |
Total grant date fair value of restricted stock units vested |  |  |  |  | $ 7,600 | $ 4,100 |
Unvested Options |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |
Incentive options, vesting period |  |  |  |  | 5 years |  |
Underwriters | Common Stock |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |
Exercised number of shares | 207,000 | 410,156 |  |  |  |  |

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