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Share-based Compensation - Schedule of Components of Share-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense $ 4,699 $ 5,849 $ 8,558 $ 11,534
Stock options [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 750 926 1,054 3,038
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 2,751 2,951 5,172 4,657
Market-based Restricted Stock Units [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 810 1,576 1,480 2,923
Stock purchase plan [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 388 396 852 916
Cost of sales [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 205 180 386 367
Sales and marketing [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 1,533 692 2,229 1,302
General and administrative [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 2,639 4,564 5,169 9,128
Research and development [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense $ 322 $ 413 $ 774 $ 737