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The Company, Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]                        
Loss attributable to each class $ (1,582) $ (1,868) $ (2,042) $ (19,077) $ 2,459 $ (3,974) $ (3,910) $ (1,515) $ (5,492) $ (20,592) $ (4,033) $ (21,514)
Weighted average number of shares outstanding during the period (in shares)                       2,713,782
Basic and Diluted loss per share (in dollars per share)                       $ (3.26)
Number of warrants to purchase common stock (in shares)                     403,090 1,860,790
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]                        
Potential common stock equivalents (in shares)                     5,665,131 10,195,281
Series C Convertible Preferred Stock [Member]                        
Earnings Per Share [Abstract]                        
Loss attributable to each class                     $ (1,124) $ (12,663)
Weighted average number of shares outstanding during the period (in shares)                     20,368 10,444
Basic and Diluted loss per share (in dollars per share)                     $ (55.20) $ (1,212.47)
Warrants [Member]                        
Earnings Per Share [Abstract]                        
Number of warrants to purchase common stock (in shares)                     403,090  
Common Stock [Member]                        
Earnings Per Share [Abstract]                        
Loss attributable to each class                     $ (2,909) $ (8,851)
Weighted average number of shares outstanding during the period (in shares)                     19,589,031 2,713,782
Basic and Diluted loss per share (in dollars per share)                     $ (0.15) $ (3.26)
Common Stock Equivalents of Convertible Debentures [Member]                        
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]                        
Potential common stock equivalents (in shares)                     0 6,622,821
Common Stock Purchase Warrants [Member]                        
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]                        
Potential common stock equivalents (in shares)                     2,397,166 2,406,625
Common Stock Equivalents of Convertible Preferred Stock [Member]                        
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]                        
Potential common stock equivalents (in shares)                     0 289,462
Restricted Stock Units [Member]                        
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]                        
Potential common stock equivalents (in shares)                     79,068 0
Common Stock Options [Member]                        
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]                        
Potential common stock equivalents (in shares)                     3,188,897 876,373