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Stock-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Additional General Disclosures [Abstract]            
Stock-based compensation expense   $ 303 $ 184 $ 626 $ 203  
Compensation Cost Not yet Recognized [Abstract]            
Unrecognized compensation expense   $ 1,884   $ 1,884    
Weighted average period of recognition       1 year 18 days    
Stock Options [Member]            
Number of Stock Options [Abstract]            
Options outstanding (in shares)   4,033,038   4,033,038    
Weighted average exercise price, outstanding (in dollars per share)   $ 1.78   $ 1.78    
Vested (in shares)   1,640,421   1,640,421    
Exercisable (in shares)   1,640,421   1,640,421    
Exercised (in shares)       (86,250)    
Weighted average exercise price, exercised (in dollars per share)       $ 1.74    
Issuance of common stock (in shares)       36,410    
Number of shares available for issuance (in shares)   1,385,011   1,385,011    
Restricted Stock Units [Member] | Members of the Board of Directors [Member]            
Restricted Stock Units [Abstract]            
Granted (in shares)           140,097
Fair value (in dollars per share)           $ 2.07
Restricted stock cancelled (in shares) (19,324)          
Term of vesting       12 months    
Aggregate grant date fair value       $ 290