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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Stock-based compensation      
Stock-based compensation expense $ 2.4 $ 3.7  
Stock Options      
Stock-based compensation      
Employee stock options granted (shares) 719,813    
Total grant date fair value $ 4.5    
Total unrecognized compensation cost related to stock-based compensation arrangements $ 5.8    
Unrecognized compensation cost related to stock-based compensation arrangements average recognition period 2 years 10 months    
Stock Options | Minimum      
Stock-based compensation      
Exercise price of options granted (usd per share) $ 5.52    
Stock Options | Maximum      
Stock-based compensation      
Exercise price of options granted (usd per share) $ 6.78    
Restricted Stock Units (RSUs)      
Stock-based compensation      
Total grant date fair value $ 3.4    
Number of stock units granted (shares) 531,410    
Vesting period of the grant date fair value 4 years    
Total unrecognized compensation cost related to stock-based compensation arrangements $ 13.5    
Unrecognized compensation cost related to stock-based compensation arrangements average recognition period 2 years 7 months    
Restricted Stock Units (RSUs) | Minimum      
Stock-based compensation      
Weighted average fair value per stock units granted (usd per share) $ 5.52    
Restricted Stock Units (RSUs) | Maximum      
Stock-based compensation      
Weighted average fair value per stock units granted (usd per share) $ 6.78    
Executive Officer | Restricted Stock Units (RSUs)      
Stock-based compensation      
Number of stock units granted (shares)     87,620
Executive Officer | Performance-based shares      
Stock-based compensation      
Number of stock units granted (shares)     184,050
Weighted average fair value per stock units granted (usd per share)     $ 7.10