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Stockholders' Equity - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Number of Shares          
Options outstanding, beginning balance (in shares)     6,963,000    
Granted (in shares) 0 0 0 0  
Exercised (in shares)     (1,527,000)    
Cancelled/forfeited (in shares)     (261,000)    
Options outstanding, ending balance (in shares) 5,175,000   5,175,000   6,963,000
Options vested and exercisable (in shares) 3,912,000   3,912,000    
Options unvested and exercisable (in shares) 173,000   173,000    
Stock Options Weighted Average Exercise Price          
Options outstanding, weighted average exercise price, beginning of period (in USD per share) $ 5.27   $ 5.27   $ 5.63
Granted, weighted average exercise price (in USD per share)     0    
Exercised, weighted average exercise price (in USD per share)     5.96    
Cancelled/forfeited, weighted average exercise price (in USD per share)     11.00    
Options outstanding, weighted average exercise price, end of period (in USD per share) 5.27   5.27   $ 5.63
Vested and exercisable, weighted-average exercise price (in USD per share) 3.97   3.97    
Unvested and exercisable, weighted-average exercise price (in USD per share) $ 6.65   $ 6.65    
Stock Option Activity, Additional Disclosures          
Weighted-average remaining contractual period     5 years 2 months 12 days   6 years 8 months 12 days
Vested and exercisable, weighted average contractual term     4 years 7 months 6 days    
Unvested and exercisable, weighted average contractual term     7 years 1 month 6 days    
Aggregate intrinsic value $ 182,027   $ 182,027   $ 569,094
Vested and exercisable, aggregate intrinsic value 142,675   142,675    
Unvested and exercisable, aggregate intrinsic value $ 5,841   $ 5,841