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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Equity-based compensation          
Options issued (in shares) 1,123,826   1,123,826   1,279,379
Weighted average fair market value of options granted (in dollars per share)     $ 2.12 $ 1.53  
Stock-based compensation expense $ 0.1 $ 0.6 $ 0.1 $ 1.1  
Fair value of options vested     0.4    
Service Based Stock Options          
Equity-based compensation          
Unrecognized compensation cost $ 1.1   $ 1.1    
Recognition period (years)     2 years 4 months 24 days    
The Plan          
Equity-based compensation          
Number of shares allowed for issuance (in shares) 2,533,333   2,533,333    
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) 1,396,423   1,396,423    
The Plan | Options | Director          
Equity-based compensation          
Vesting period (in years)     1 year    
Equity incentive outside of the Plan | Options          
Equity-based compensation          
Options issued (in shares) 8,334   8,334