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Stock-based Compensation - Schedule of Vested Stock Options (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares      
Number of shares outstanding (in shares) 3,832,424 4,122,910 4,512,952
Granted (in shares) 0 108,288 612,771
Exercised (in shares) (2,590,274) (284,642) (867,024)
Forfeited/expired (in shares) (13,751) (114,132) (135,789)
Number of shares outstanding (in shares) 1,228,399 3,832,424 4,122,910
Weighted Average Grant Date Fair Value      
Weighted average grant date fair value, outstanding (in usd per share) $ 0.73 $ 0.69 $ 0.60
Granted (in usd per share) 0 1.73 1.27
Exercised (in usd per share) 0.62 0.40 0.59
Forfeited/expired (in usd per share) 0.77 1.03 0.96
Weighted average grant date fair value, outstanding (in usd per share) 0.96 0.73 0.69
Weighted Average Exercise Price      
Weighted average exercise price, outstanding (in usd per share) 2.16 2.03 1.75
Granted (in usd per share) 0 5.10 3.72
Exercised (in usd per share) 1.84 1.15 1.62
Forfeited/expired (in usd per share) 2.33 2.96 2.73
Weighted average exercise price, outstanding (in usd per share) $ 2.91 $ 2.16 $ 2.03