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Share-Based Compensation - Stock Option Activity - Textual (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Nov. 16, 2018
Mar. 22, 2018
Mar. 18, 2018
Jan. 02, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted (in shares)           1,120,500   660,557
Weighted average exercise price, granted (USD per share)           $ 1.44   $ 1.61
Exercise of stock options (in shares)           30,000 6,250 6,250
Executives and Key Personnel                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted (in shares)       492,000        
Weighted average exercise price, granted (USD per share)       $ 1.39        
Award requisite service period       1 year        
Board of Directors                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted (in shares)       250,000        
Weighted average exercise price, granted (USD per share)       $ 1.39        
Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted (in shares) 16,000              
Weighted average exercise price, granted (USD per share) $ 1.76     $ 1.39        
Exercise of stock options (in shares)       87,500        
Key Personnel                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted (in shares)     50,000          
Weighted average exercise price, granted (USD per share)     $ 1.44          
Chief Accounting Officer                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted average exercise price, granted (USD per share) $ 1.76   $ 1.44          
Number of shares available for grant (in shares)     50,000          
Stock Option | Board of Directors | Share-based Compensation Award, Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of options that will vest       25.00%        
Stock Option | Board of Directors | Share-based Compensation Award, Tranche Two through Five                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of options that will vest       75.00%        
Award vesting period       4 years        
Stock Option | Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       4 years        
One-time, vesting period 4 years              
Stock Option | Key Personnel                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award requisite service period     1 year          
Stock Option | Chief Accounting Officer                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for grant (in shares) 125,000   50,000          
Stock Option | Former Chief Financial Officer                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Incremental cost from modification of terms   $ 39            
Stock Option, Sign-On Award | Chief Accounting Officer                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted (in shares)         50,000      
Award vesting period     4 years   4 years