Employee withhold percentage of gross earnings.

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Share Based Compensation Arrangement By Share Based Payment Award Increase In Number Of Shares Reserved And Available For Issuance Percentage

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Aggregate number of common shares reserved for future issuance.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Price of a single share of a number of saleable stocks of a company.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Purchase price of common stock expressed as a percentage of its fair value.

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Per share or per unit amount of equity securities issued.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands								1 Months Ended				12 Months Ended
	Sep. 14, 2018	Mar. 15, 2018	Sep. 15, 2017	Mar. 15, 2017	Sep. 15, 2016	Mar. 15, 2016	Oct. 08, 2015	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Jul. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 16, 2018	Sep. 18, 2017	Mar. 16, 2017	Mar. 16, 2016	Jul. 17, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period												4 years
Expiration period												10 years
Purchase price of common stock by employees												85.00%
Issuance of common stock under ESPP												$ 3,637	$ 2,914	$ 3,724
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, weighted-average grant date fair value (in dollars per share)												$ 13.11	$ 9.38	$ 8.35
2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for future issuance (in shares)											800,000
Share-based compensation, increase in number of shares reserved and available for issuance as percentage under the plan											4.00%
Increase in number of shares authorized (in shares)							1,500,000	1,762,149	1,702,187	1,661,616
Number of shares authorized (in shares)												11,888,081
Shares available for grant (in shares)												998,777
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for future issuance (in shares)																			800,000
Increase in number of shares authorized (in shares)								440,537	425,547	415,404
Number of shares authorized (in shares)												2,081,488
Shares available for grant (in shares)												1,268,266
Issuance of common stock under ESPP (in shares)	96,108	123,607	109,144	138,085	153,602	192,676
Issuance of common stock under ESPP	$ 2,000	$ 1,600	$ 1,400	$ 1,500	$ 1,600	$ 2,100
Share issued, price per share (in dollars per share)				$ 12.79	$ 10.60	$ 10.88									$ 21.96	$ 14.78	$ 12.96	$ 10.60
Closing price of shares issued (in dollars per share)				$ 15.05		$ 12.80									$ 25.84	$ 17.39	$ 15.25	$ 12.47
Employee Stock Purchase Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, weighted-average grant date fair value (in dollars per share)												$ 10.95	$ 5.35	$ 5.49
Employee withholding percentage												15.00%
Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, restricted stock												$ 54,400
Unrecognized compensation, recognition period												2 years 8 months 12 days
Options to Purchase Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, stock options												$ 6,400
Unrecognized compensation, recognition period												1 year 10 months 24 days
Stock options vested, fair value												$ 5,100	$ 5,900	$ 3,400
Stock options granted, weighted-average grant date fair value (in dollars per share)												$ 11.86	$ 6.72	$ 6.38