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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Stockholders Equity Note Disclosure [Line Items] |  |  |
Stock-based compensation expense | $ 3,251 | $ 2,268 |
Stock options, outstanding | 1,027,831 |  | 998,226
Closing price of common stock | $ 59.08 |  |
Aggregate intrinsic value of stock options exercised | $ 100 | $ 200 |
Weighted average grant date fair value of share-based awards granted | $ 30.21 | $ 18.27 |
Total fair value of stock options vested | $ 2,200 | $ 1,300 |
Total unrecognized compensation cost | $ 33,200 |  |
Unrecognized compensation cost, weighted average remaining requisite service period | 4 years 3 months 14 days |  |
Number of unvested options and restricted stock units | 1,067,389 |  |
2018 Plan |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |
Common stock shares reserved for Issuance |  |  | 2,778,000
Incentive options, vesting period | 2,747,792 |  |
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 | 1,027,831 | 1,109,353 |
Restricted Stock Units (RSUs) |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |
Incentive options, vesting period | 5 years |  |
Restricted stock units, outstanding | 680,549 | 703,076 | 705,413
Closing price of common stock | $ 59.08 |  |
Aggregate intrinsic value of restricted stock units vested | $ 9,500 | $ 3,200 |
Weighted average grant date fair value of restricted stock units granted | $ 31.79 | $ 33.80 |
Total grant date fair value of restricted stock units vested | $ 4,900 | $ 2,600 |
Unvested Options |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |
Incentive options, vesting period | 5 years |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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