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Stock-Based Compensation - Restricted Stock Awards, Restricted Stock Units and Common Stock Awards (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted stock      
Number of Restricted Share Awards      
Nonvested restricted shares outstanding, beginning balance (in shares) 74,724    
Granted (in shares) 0 0 91,348
Vested (in shares) (8,750)   0
Nonvested restricted shares outstanding, ending balance (in shares) 65,974 74,724  
Weighted Average Grant-Date Fair Value      
Nonvested restricted shares outstanding, beginning balance (in dollars per share) $ 4.19    
Granted (in dollars per share)     $ 2.96
Vested (in dollars per share) 8.21    
Nonvested restricted shares outstanding, ending balance (in dollars per share) $ 3.65 $ 4.19  
Additional disclosures      
Annual increment period 3 years    
Unrecognized compensation cost $ 15,000    
Period over which unrecognized compensation expense is expected to be recognized 1 month 17 days    
Aggregate vesting date fair value of restricted awards $ 48,000 $ 84,000  
Restricted stock | Minimum      
Additional disclosures      
Vesting period 1 year    
Restricted stock | Maximum      
Additional disclosures      
Vesting period 3 years    
Restricted stock units      
Number of Restricted Share Awards      
Nonvested restricted shares outstanding, beginning balance (in shares) 413,385    
Granted (in shares) 268,000 238,350 206,220
Vested (in shares) (43,050)    
Forfeited (in shares) (11,250)    
Nonvested restricted shares outstanding, ending balance (in shares) 627,085 413,385  
Weighted Average Grant-Date Fair Value      
Nonvested restricted shares outstanding, beginning balance (in dollars per share) $ 3.60    
Granted (in dollars per share) 7.14 $ 3.96 $ 2.96
Vested (in dollars per share) 4.40    
Forfeited (in dollars per share) 5.63    
Nonvested restricted shares outstanding, ending balance (in dollars per share) $ 5.03 $ 3.60  
Additional disclosures      
Annual increment period 3 years    
Unrecognized compensation cost $ 1,868,000    
Period over which unrecognized compensation expense is expected to be recognized 1 year 6 months 29 days    
Aggregate vesting date fair value of restricted awards $ 273,000 $ 422,000 $ 156,000
Restricted stock units | Minimum      
Additional disclosures      
Vesting period 1 year    
Restricted stock units | Maximum      
Additional disclosures      
Vesting period 3 years    
Common stock awards      
Number of Restricted Share Awards      
Granted (in shares) 59,284 67,498 66,200
Weighted Average Grant-Date Fair Value      
Granted (in dollars per share) $ 5.59 $ 4.74 $ 6.31