Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Stock Option Activity (Details)

v3.10.0.1
Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Number of Options    
Number of stock options, outstanding, balance (in shares) 16,268  
Number of stock options, granted (in shares) 1,469  
Number stock options, exercised (in shares) (2,555)  
Number of stock options, cancelled (in shares) (834)  
Number of stock options, outstanding, balance (in shares) 14,348 16,268
Weighted Average Exercise Price    
Weighted-average exercise price, outstanding, balance (in dollars per share) $ 5.70  
Weighted-average exercise price, granted (in dollars per share) 8.48  
Weighted-average exercise price, exercised (in dollars per share) 5.40  
Weighted-average exercise price, cancelled (in dollars per share) 6.56  
Weighted-average exercise price, outstanding, balance (in dollars per share) $ 5.98 $ 5.70
Weighted-average remaining contractual life, options outstanding 6 years 9 months 21 days 7 years 4 months 28 days
Aggregate intrinsic value, options outstanding $ 93,159 $ 14,832
Options vested and exercisable, number of options (in shares) 8,093  
Options vested and exercisable, weighted average exercise price (in dollars per share) $ 5.53  
Options vested and exercisable, weighted average remaining contractual life 5 years 6 months 21 days  
Options vested and exercisable, aggregate intrinsic value $ 56,270