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Share-based Compensation - Schedule of Components of Share-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated share based compensation expense $ 3,721 $ 3,859
Stock options [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated share based compensation expense 661 304
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 1,727 2,421
Market-based Restricted Stock Units [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated share based compensation expense 897 670
Stock purchase plan [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated share based compensation expense 436 464
Cost of sales [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated share based compensation expense 178 181
Sales and marketing [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated share based compensation expense 717 696
General and administrative [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated share based compensation expense 2,529 2,530
Research and development [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated share based compensation expense $ 297 $ 452