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Stock-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
May 23, 2018
Mar. 30, 2018
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Additional General Disclosures [Abstract]              
Stock-based compensation expense     $ 367   $ 63 $ 570 $ 136
Compensation Cost Not yet Recognized [Abstract]              
Unrecognized compensation expense     $ 2,854     $ 2,854  
Unrecognized compensation expense, weighted average period           1 year 4 months 13 days  
Stock Options [Member]              
Number of Stock Options [Abstract]              
Options outstanding (in shares)     4,342,765     4,342,765  
Weighted average exercise price (in dollars per share)     $ 2.02     $ 2.02  
Vested (in shares)     785,461     785,461  
Exercisable (in shares)     785,461     785,461  
Number of shares available for issuance (in shares)     1,134,521     1,134,521  
Additional General Disclosures [Abstract]              
Term of vesting           3 years  
Expiration period           10 years  
Stock Options [Member] | March 30, 2018 [Member] | Interim Chief Executive Officer [Member]              
Number of Stock Options [Abstract]              
Granted (in shares)   1,557,628          
Strike price (in dollars per share)   $ 1.12          
Additional General Disclosures [Abstract]              
Aggregate fair value of shares issued   $ 950          
Stock Options [Member] | May 23, 2018 [Member] | Interim Chief Executive Officer [Member]              
Number of Stock Options [Abstract]              
Granted (in shares) 1,413,249            
Strike price (in dollars per share) $ 1.66            
Additional General Disclosures [Abstract]              
Aggregate fair value of shares issued $ 1,237            
Stock Options [Member] | May 29, 2018 [Member] | Management [Member]              
Number of Stock Options [Abstract]              
Granted (in shares)       800,000      
Additional General Disclosures [Abstract]              
Aggregate fair value of shares issued       $ 801      
Stock Options [Member] | May 29, 2018 [Member] | Management [Member] | Minimum [Member]              
Number of Stock Options [Abstract]              
Strike price (in dollars per share)       $ 1.66      
Stock Options [Member] | May 29, 2018 [Member] | Management [Member] | Maximum [Member]              
Number of Stock Options [Abstract]              
Strike price (in dollars per share)       $ 1.93      
Restricted Stock Units [Member] | June 6, 2018 [Member] | New Members of the Board of Directors [Member]              
Additional General Disclosures [Abstract]              
Term of vesting           12 months  
Expiration period           10 years  
Restricted Stock Units [Abstract]              
Granted (in shares)           140,097  
Strike price (in dollars per share)           $ 2.07  
Aggregate grant date fair value           $ 290