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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Stock-Based Compensation [Abstract]  
Schedule of compensation expense
    Three Months Ended  
    March 31,  
    2018     2017  
Stock-based compensation costs included in:      
Costs of sales   $ (6 )   $ 2  
Sales and marketing expense     6       19  
General and administrative expense     64       50  
Total stock-based compensation expense   $ 64     $ 71