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