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Stock-Based Compensation - Restricted Stock Awards, Restricted Stock Units and Common Stock Awards (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted stock      
Number of Restricted Share Awards      
Nonvested restricted shares outstanding, beginning balance (in shares) 87,000    
Granted (in shares) 0 87,000 0
Vested (in shares) (10,833) 0 0
Forfeited (in shares) (5,000)    
Nonvested restricted shares outstanding, ending balance (in shares) 71,167 87,000  
Weighted Average Grant-Date Fair Value      
Nonvested restricted shares outstanding, beginning balance (in dollars per share) $ 2.96    
Granted (in dollars per share)   $ 2.96  
Vested (in dollars per share) 7.00    
Forfeited (in dollars per share) 2.96    
Nonvested restricted shares outstanding, ending balance (in dollars per share) $ 4.19 $ 2.96  
Additional disclosures      
Vesting period 3 years    
Annual increment period 3 years    
Unrecognized compensation cost $ 137,000    
Period over which unrecognized compensation expense is expected to be recognized 1 year 1 month 13 days    
Aggregate vesting date fair value of restricted awards $ 84,000    
Restricted stock units      
Number of Restricted Share Awards      
Nonvested restricted shares outstanding, beginning balance (in shares) 253,315    
Granted (in shares) 227,000 196,400 10,000
Vested (in shares) (81,615)    
Forfeited (in shares) (5,000)    
Nonvested restricted shares outstanding, ending balance (in shares) 393,700 253,315  
Weighted Average Grant-Date Fair Value      
Nonvested restricted shares outstanding, beginning balance (in dollars per share) $ 4.24    
Granted (in dollars per share) 3.96 $ 2.96 $ 5.76
Vested (in dollars per share) 6.58    
Forfeited (in dollars per share) 3.97    
Nonvested restricted shares outstanding, ending balance (in dollars per share) $ 3.60 $ 4.24  
Additional disclosures      
Annual increment period 3 years    
Unrecognized compensation cost $ 921,000    
Period over which unrecognized compensation expense is expected to be recognized 1 year 9 months 22 days    
Aggregate vesting date fair value of restricted awards $ 422,000 $ 156,000 $ 85,000
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) 67,498 66,200 58,937
Weighted Average Grant-Date Fair Value      
Granted (in dollars per share) $ 4.74 $ 6.31 $ 4.53