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Stockholders' Equity - Schedule of Exercise Prices And Weighted-average Remaining Contractual Lives For Options Outstanding (Details)
 12 Months Ended
Dec. 31, 2019
$ / shares
shares
Options Outstanding (in shares) | shares 16,664,640
Weighted- Average Remaining Contractual Life (Year) 7 years 6 months 29 days
Weighted- Average Exercise Price (in dollars per share) $ 20.47
Options Exercisable (in shares) | shares 7,436,379
Weighted- Average Exercise Price of Options Exercisable $ 17.02
Exercise Price Range 1  
Options Outstanding (in shares) | shares 3,027,881
Range of Exercise Prices, Lower Limit (in dollars per share) $ 5.20
Range of Exercise Prices, Upper Limit (in dollars per share) $ 13.00
Weighted- Average Remaining Contractual Life (Year) 4 years 11 months 19 days
Weighted- Average Exercise Price (in dollars per share) $ 10.16
Options Exercisable (in shares) | shares 2,720,921
Weighted- Average Exercise Price of Options Exercisable $ 9.84
Exercise Price Range 2  
Options Outstanding (in shares) | shares 3,834,655
Range of Exercise Prices, Lower Limit (in dollars per share) $ 13.05
Range of Exercise Prices, Upper Limit (in dollars per share) $ 17.00
Weighted- Average Remaining Contractual Life (Year) 7 years 5 months 1 day
Weighted- Average Exercise Price (in dollars per share) $ 16.23
Options Exercisable (in shares) | shares 2,326,188
Weighted- Average Exercise Price of Options Exercisable $ 16.17
Exercise Price Range 3  
Options Outstanding (in shares) | shares 1,623,707
Range of Exercise Prices, Lower Limit (in dollars per share) $ 17.05
Range of Exercise Prices, Upper Limit (in dollars per share) $ 24.55
Weighted- Average Remaining Contractual Life (Year) 8 years 3 days
Weighted- Average Exercise Price (in dollars per share) $ 20.10
Options Exercisable (in shares) | shares 704,338
Weighted- Average Exercise Price of Options Exercisable $ 20.48
Exercise Price Range 4  
Options Outstanding (in shares) | shares 2,336,151
Exercise Prices $ 24.97
Weighted- Average Remaining Contractual Life (Year) 8 years 11 months 4 days
Weighted- Average Exercise Price (in dollars per share) $ 24.97
Options Exercisable (in shares) | shares 644,066
Weighted- Average Exercise Price of Options Exercisable $ 24.97
Exercise Price Range 5  
Options Outstanding (in shares) | shares 3,877,880
Exercise Prices $ 25.02
Weighted- Average Remaining Contractual Life (Year) 9 years 11 months 12 days
Weighted- Average Exercise Price (in dollars per share) $ 25.02
Exercise Price Range 6  
Options Outstanding (in shares) | shares 1,940,366
Range of Exercise Prices, Lower Limit (in dollars per share) $ 25.06
Range of Exercise Prices, Upper Limit (in dollars per share) $ 38.75
Weighted- Average Remaining Contractual Life (Year) 7 years 6 months 29 days
Weighted- Average Exercise Price (in dollars per share) $ 30.48
Options Exercisable (in shares) | shares 1,032,365
Weighted- Average Exercise Price of Options Exercisable $ 30.38
Exercise Price Range 7  
Options Outstanding (in shares) | shares 24,000
Exercise Prices $ 39.00
Weighted- Average Remaining Contractual Life (Year) 8 years 6 months 21 days
Weighted- Average Exercise Price (in dollars per share) $ 39.00
Options Exercisable (in shares) | shares 8,501
Weighted- Average Exercise Price of Options Exercisable $ 39.00