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Stock-Based Compensation - Summary of Stock Option and Restricted Stock Units Award Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Shares Available for Grant        
Beginning balance (in shares)   6,036,180 6,036,180  
Increase in shares authorized (in shares)     3,574,847  
Options granted (in shares) 0   (1,150,178)  
Options canceled or expired (in shares)     723,824  
RSUs granted (in shares)     (3,304,032)  
RSUs canceled or expired (in shares)     789,849  
RSUs vested and withheld for taxes (in shares)     631,186  
Ending balance (in shares) 7,301,676   7,301,676  
RSUs Outstanding, Number of Shares        
RSUs granted (in shares)     3,304,032  
RSUs canceled or expired (in shares)     (789,849)  
Options Outstanding, Number of Shares        
Beginning balance (in shares)   8,600,441 8,600,441  
Options granted (in shares) 0   1,150,178  
Options exercised (in shares)     (74,307)  
Options canceled or expired (in shares)     (723,824)  
Ending balance (in shares) 8,952,488   8,952,488  
Vested and exercisable at the end of period (in shares) 5,871,020   5,871,020  
Options Outstanding, Weighted Average Exercise Price        
Weighted Average Exercise Price, Options Outstanding (in USD per share) $ 11.09   $ 11.09 $ 11.40
Options granted (in USD per share)     8.95  
Options exercised (in USD per share)     7.11  
Options canceled or expired (in USD per share)     11.76  
Vested and exercisable at the end of period (in USD per share) $ 12.13   $ 12.13  
Options Outstanding, Weighted Average Remaining Contractual Term (Years) / Aggregate Intrinsic Value        
Weighted average remaining contractual term (years)   5 years 1 month 28 days 5 years 1 month 24 days  
Beginning balance, aggregate intrinsic value   $ 8,811 $ 8,811  
Options exercised, aggregate intrinsic value     220  
Ending balance, aggregate intrinsic value $ 1,559   $ 1,559  
Vested and exercisable at the end of period, weighted average remaining contractual term (years)     3 years 8 months 26 days  
Vested and exercisable at the end of period, aggregate intrinsic value $ 1,526   $ 1,526  
Restricted stock units        
Shares Available for Grant        
RSUs granted (in shares)     (3,304,032)  
RSUs canceled or expired (in shares)     789,849  
RSUs Outstanding, Number of Shares        
Beginning balance (in shares)   5,022,675 5,022,675  
RSUs granted (in shares)     3,304,032  
RSUs vested (in shares)     (1,767,543)  
RSUs canceled or expired (in shares)     (789,849)  
Ending balance (in shares) 5,769,315   5,769,315  
RSUs Outstanding, Weighted Average Grant Date Fair Value        
Beginning balance (in USD per share)   $ 10.66 $ 10.66  
RSUs granted (in USD per share)     8.33  
RSUs vested (in USD per share)     10.57  
RSUs canceled or expired (in USD per share)     10.91  
Ending balance (in USD per share) $ 9.32   $ 9.32