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Stockholders' Equity - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 64,909 $ 52,030 $ 38,359
Cost of revenues      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation expense 426 420 316
Research and development      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation expense 22,229 17,055 14,333
Sales and marketing      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation expense 7,380 6,703 5,007
General and administrative      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 34,874 $ 27,852 $ 18,703