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Stock-Based Compensation Restricted Stock Unit Activity (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-average period (in years) 2 years 6 months 11 days
Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested restricted shares at the beginning of the period | shares 272,195
Restricted shares granted | shares 249,925
Restricted shares vested | shares 0
Restricted shares forfeited | shares (2,000)
Unvested restricted shares at the end of the period | shares 520,120
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Unvested restricted shares at the beginning of the period (USD per share) | $ / shares $ 5.83
Granted (USD per share) | $ / shares 5.85
Vested (USD per share) | $ / shares 0.00
Forfeited (USD per share) | $ / shares 5.83
Unvested restricted shares at the end of the period (USD per share) | $ / shares $ 5.84
Granted restricted stock fair value | $ $ 1.5
Unrecognized compensation cost | $ $ 2.3
Weighted-average period (in years) 2 years 1 month 28 days