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Stock-Based Compensation (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Research and development [Member]    
Summary of stock-based compensation expense    
Stock-based compensation expense
General and administrative [Member]    
Summary of stock-based compensation expense    
Stock-based compensation expense 23 22
Sales and marketing [Member]    
Summary of stock-based compensation expense    
Stock-based compensation expense $ 6 $ 50