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Share-based Compensation - Summary of Company's Stock Option Activity (Details) - $ / shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Shares    
Outstanding at beginning of period (in shares) 6,989,856  
Granted (in shares) 662,769 331,616
Exercised (in shares) (274,037)  
Forfeited (in shares) (60,293)  
Expired (in shares) (157,434)  
Outstanding at end of period (in shares) 7,160,861  
Eligible for exercise (in shares) 5,877,428  
Weighted Average Exercise Price    
Outstanding at beginning of period (in usd per share) $ 6.57  
Granted (in usd per share) 5.45  
Exercised (in usd per share) 4.37  
Forfeited (in usd per share) 5.50  
Expired (in usd per share) 9.00  
Outstanding at end of period (in usd per share) 6.51  
Eligible for exercise (in usd per share) $ 6.31