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Stockholders' Equity (Details Narrative 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
General and administrative expenses $ 783 $ 2,705 $ 2,926 $ 4,553 $ 10,817
Restricted Stock [Member]            
Equity-based compensation expense         69 $ 1,969
General and administrative expenses         2,364  
Unrecognized compensation cost related to non-vested stock awards         $ 35  
Non-vested stock awards weighted-average period           8 months 16 days
Non-Employee Director Stock Option Plan [Member]            
Number of shares authorized (in shares)         74,000  
Number of shares reserved for issuance (in shares)         2,135  
Number of shares reserved for outstanding stock options (in shares)         12,079  
Number of shares available for future issuance (in shares)         71,865  
Equity Compensation Plan ("2005 Equity Plan") [Member]            
Number of shares authorized (in shares)         1,200,000  
Number of shares reserved for issuance (in shares)         467,328  
Number of shares reserved for outstanding stock options (in shares)         143,815  
Number of shares available for future issuance (in shares)         0