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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense $ 5,849 $ 5,215 $ 11,534 $ 9,131
Stock options [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 926 1,241 3,038 1,863
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 2,951 1,789 4,657 3,236
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   270   759
Market-based Restricted Stock Units [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 1,576 1,604 2,923 2,557
Stock purchase plan [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 396 311 916 716
Cost of sales [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 180 132 367 257
Sales and marketing [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 692 473 1,302 922
General and administrative [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 4,564 4,249 9,128 7,294
Research and development [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense $ 413 $ 361 $ 737 $ 658