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Stock Option Plan - Stock-based compensation (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 138 $ 87 $ 331 $ 165
Cost of Revenue        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 1 1 1 1
Engineering and Product Development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 9 12 17 24
Sales and Marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 22 24 51 45
General and Administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 106 $ 50 $ 262 $ 95