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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Sep. 03, 2009
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2013
Equity-based compensation              
Options issued (in shares)   4,195,650   4,195,650   3,134,094  
Weighted average fair market value of options granted (in dollars per share)       $ 1.53 $ 3.57    
Stock-based compensation expense   $ 0.6 $ 0.8 $ 1.1 $ 1.0    
Fair value of options vested       1.6      
Service Based Stock Options              
Equity-based compensation              
Unrecognized compensation cost   $ 4.7   $ 4.7      
Recognition period (years)       2 years 9 months      
The Plan              
Equity-based compensation              
Number of shares allowed for issuance (in shares) 7,600,000            
The Plan | Options              
Equity-based compensation              
Terms of options, not to exceed (in years) 10 years            
Vesting percentage per year 25.00%            
Vesting period (in years) 4 years            
Options available for grant (in shares)   3,365,103   3,365,103      
Equity incentive outside of the Plan | Options              
Equity-based compensation              
Options issued (in shares)             25,000
Director | The Plan | Options              
Equity-based compensation              
Vesting period (in years) 1 year