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Stock-Based Compensation (Details) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Compensation not yet recognized   $ 509,000    
Proceeds from exercise of stock options   $ 0 $ 0 $ 0
Period for recognition (in years)   1 year 6 months    
Vesting period (in years)   10 years    
Requisite service period (in years)   4 years    
Weighted-average fair value of options granted during the year (in dollars per share)   $ 0.00 $ 0.68 $ 1.11
Share Price (in dollars per share)   $ 1.19    
Total stock-based compensation expense   $ 233,000 $ 1,389,000 $ 1,991,000
Vested (in shares)   48,890 981,633  
Vested (in dollars per share)   $ 77,000 $ 2,794,000  
Minimum        
Vesting period (in years)   2 years    
Maximum        
Vesting period (in years)   4 years    
Non-Vested Stock Options        
Compensation not yet recognized   $ 0    
Restricted Stock Units (RSUs)        
Total stock-based compensation expense   $ 233,000 $ 1,269,000 $ 1,901,000
2014 Long-Term Incentive Plan        
Number of shares reserved for future issuance (in shares)   5,600,676    
Number of additional shares reserved for future issuance (in shares) 1,200,000      
Number of shares available for grant (in shares)   2,133,733    
Deferred Compensation, Share-based Payments | Deferred Compensation Plans For Directors        
Total stock-based compensation expense   $ 0    
Second Anniversary of Award Date        
Percent of options vesting   50.00%    
Third Anniversary of Award Date        
Percent of options vesting   25.00%    
Fourth Anniversary of Award Date        
Percent of options vesting   25.00%