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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Number of Options    
Outstanding, beginning balance (in shares) 2,411,000  
Granted (in shares) 1,028,000  
Exercised (in shares) (13,561) (1,443,685)
Forfeitures (in shares) 0  
Expired (in shares) 0  
Outstanding, ending balance (in shares) 3,425,000  
Number of options, expected to vest (in shares) 1,363,000  
Number of options, exercisable (in shares) 1,613,000  
Weighted Average Exercise Price    
Outstanding, beginning balance (in dollars per share) $ 23.43  
Granted (in dollars per share) 27.34  
Exercised (in dollars per share) 8.97  
Forfeitures (in dollars per share) 0  
Expired (in dollars per share) 0  
Outstanding, ending balance (in dollars per share) 24.68  
Weighted average exercise price, expected to vest (in dollars per share) 28.72  
Weighted average exercise price, exercisable (in dollars per share) $ 20.31  
Weighted Average- Remaining Contractual Terms    
Outstanding, ending balance 7 years 11 months 4 days  
Vested and expected to vest 9 years 4 months 2 days  
Exercisable 6 years 5 months 1 day  
Aggregate Intrinsic Value    
Outstanding, ending balance $ 12,430  
Vested and expected to vest 1,267  
Exercisable $ 10,612