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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
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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

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