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Share-based Compensation - Schedule of Share-Based Compensation by Line Item in Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated share based compensation expense | $ 5,844 | $ 5,261 | $ 17,378 | $ 14,392
Stock options [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated share based compensation expense | 599 | 579 | 3,637 | 2,442
Time-based Restricted Stock Awards and Units [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated share based compensation expense | 3,805 | 2,244 | 8,462 | 5,480
Performance-based Restricted Stock Awards and Units [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated share based compensation expense |  | 734 |  | 1,493
Market-based Restricted Stock Units [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated share based compensation expense | 1,092 | 1,298 | 4,015 | 3,855
Stock purchase plan [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated share based compensation expense | 348 | 406 | 1,264 | 1,122
Cost of sales [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated share based compensation expense | 169 | 151 | 536 | 408
Sales and marketing [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated share based compensation expense | 583 | 514 | 1,885 | 1,436
General and administrative [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated share based compensation expense | 4,760 | 4,194 | 13,888 | 11,488
Research and development [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated share based compensation expense | $ 332 | $ 402 | $ 1,069 | $ 1,060

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