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Share-Based Compensation - Stock Option Activity (Details) - Options to purchase Common Stock - $ / shares
shares in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Number of Options (in thousands)    
Beginning balance (in shares) 2,863  
Granted (in shares) 1,008  
Exercised (in shares) (216)  
Forfeited or canceled (in shares) (117)  
Ending balance (in shares) 3,538  
Weighted Average Exercise Price    
Beginning balance (in usd per share) $ 4.85  
Granted (in usd per share) 7.56 $ 11.46
Exercised (in usd per share) 0.65  
Forfeited or canceled (in usd per share) (10.18)  
Ending balance (in usd per share) $ 5.70