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Stock Plans and Stock-Based Compensation - Market-Based Restricted Stock Units - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense $ 8,301 $ 3,541 $ 24,094 $ 20,257
Dividend rate     0.00%  
Market-Based Restricted Stock Units        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation, number of stock unit grants in period     0  
Share Based compensation threshold consecutive trading days     30 days  
Stock-based compensation expense   $ 100 $ 0 $ 10,300
Dividend rate     0.00%  
Expected term (in years)     10 years  
Unrecognized compensation expense $ 0   $ 0  
Vesting of restricted stock units     657 543,825
Market-Based Restricted Stock Units | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation, vesting stock price trigger     $ 35  
Share-based compensation, share price on the date of issuance $ 23.16   $ 23.16  
Risk-free interest rate     2.26%  
Expected volatility     50.00%  
Market-Based Restricted Stock Units | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation, vesting stock price trigger     $ 65  
Share-based compensation, share price on the date of issuance $ 51.99   $ 51.99  
Risk-free interest rate     2.85%  
Expected volatility     60.00%