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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
Mar. 31, 2019
Mar. 31, 2018
Stock based compensation related to equity instruments granted to related parties $ 788 $ 751
Employees [Member] | Selling, General and Administrative [Member]    
Stock based compensation related to equity instruments granted to related parties 638 593
Directors [Member] | Selling, General and Administrative [Member]    
Stock based compensation related to equity instruments granted to related parties 75 50
Consultants [Member] | Selling, General and Administrative [Member]    
Stock based compensation related to equity instruments granted to related parties $ 75 $ 108