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Stock-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Additional General Disclosures [Abstract]        
Stock-based compensation expense   $ 323 $ 19  
Compensation Cost Not yet Recognized [Abstract]        
Unrecognized compensation expense   $ 2,189    
Weighted average period of recognition   1 year 1 month 28 days    
Stock Options [Member]        
Number of Stock Options [Abstract]        
Options outstanding (in shares)   4,271,515    
Weighted average exercise price, outstanding (in dollars per share)   $ 2.02    
Vested (in shares)   1,009,097    
Exercisable (in shares)   1,009,097    
Exercised (in shares)   (71,250)    
Weighted average exercise price, exercised (in dollars per share)   $ 1.83    
Issuance of common stock (in shares)   28,824    
Number of shares available for issuance (in shares)   1,142,210    
Restricted Stock Units [Member] | New Members of the Board of Directors [Member]        
Restricted Stock Units [Abstract]        
Granted (in shares)       140,097
Fair market 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