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Stock-Based Compensation - Restricted Stock Awards, Restricted Stock Units and Common Stock Award (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2014
Dec. 31, 2016
Additional disclosures          
Merger Exchange Ratio   1.76      
Restricted stock          
Number of Restricted Share Awards          
Grants ( in shares) 0 87,000 0 0  
Nonvested restricted shares outstanding, ending balance (in shares)   87,000      
Weighted Average Grant-Date Fair Value          
Grants (in dollars per share)   $ 2.96      
Nonvested restricted shares outstanding, ending balance (in dollars per share)   $ 2.96      
Additional disclosures          
Weighted average participating restricted stock included in common stock outstanding   87,000     87,000
Vesting period   3 years      
Annual increment period   3 years      
Unrecognized compensation cost         $ 173,000
Period over which unrecognized compensation expense is expected to be recognized   2 years 1 month 13 days      
Restricted stock | Weighted Average          
Number of Restricted Share Awards          
Nonvested restricted shares outstanding, beginning balance (in shares) 182,160   182,160    
Nonvested restricted shares outstanding, ending balance (in shares) 182,160     182,160  
Additional disclosures          
Weighted average participating restricted stock included in common stock outstanding 182,160   182,160 182,160  
Restricted stock units          
Number of Restricted Share Awards          
Nonvested restricted shares outstanding, beginning balance (in shares)   129,247      
Grants ( in shares) 94,898 196,400 10,000 38,555  
Vested (in shares)   (20,221)      
Forfeited (in shares)   (52,111)      
Nonvested restricted shares outstanding, ending balance (in shares)   253,315 129,247    
Weighted Average Grant-Date Fair Value          
Nonvested restricted shares outstanding, beginning balance (in dollars per share)   $ 8.85      
Grants (in dollars per share) $ 6.79 2.96 $ 5.76 $ 18.02  
Vested (in dollars per share)   18.15      
Forfeited (in dollars per share)   5.45      
Nonvested restricted shares outstanding, ending balance (in dollars per share)   $ 4.24 $ 8.85    
Additional disclosures          
Weighted average participating restricted stock included in common stock outstanding   129,247 129,247   253,315
Unrecognized compensation cost         $ 514,000
Period over which unrecognized compensation expense is expected to be recognized   1 year 8 months 19 days      
Weighted Average Grant Date Fair Value   $ 18.15      
Common Stock Awards          
Number of Restricted Share Awards          
Grants ( in shares) 21,730 66,200 58,937 9,706  
Weighted Average Grant-Date Fair Value          
Vested (in dollars per share) $ 7.59 $ 6.31 $ 4.53 $ 17.61  
Additional disclosures          
Weighted Average Grant Date Fair Value $ 7.59 $ 6.31 $ 4.53 $ 17.61