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Stockholders' Equity and Stock-based Compensation - Schedule of Stock Based Compensation Granted to Employees Directors Consultants (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stock based compensation related to equity instruments granted to related parties $ 602 $ 648 $ 2,058 $ 2,265
Employees [Member] | Selling, General and Administrative [Member]        
Stock based compensation related to equity instruments granted to related parties 527 598 1,790 2,050
Directors [Member] | Selling, General and Administrative [Member]        
Stock based compensation related to equity instruments granted to related parties 75 50 160 155
Consultants [Member] | Selling, General and Administrative [Member]        
Stock based compensation related to equity instruments granted to related parties $ 108 $ 60