General form of registration statement for all companies including face-amount certificate companies

Stock-Based Compensation - Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs (Details)

v3.8.0.1
Stock-Based Compensation - Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
Total stock-based compensation expense $ 54 $ 56 $ 173 $ 211 $ 273 $ 986
Cost of Revenue [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
Total stock-based compensation expense 6 10 13 17 50
Research and Development [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
Total stock-based compensation expense 11 18 61 71 104 177
General and Administrative [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
Total stock-based compensation expense 23 20 69 95 132 514
Selling and Marketing [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
Total stock-based compensation expense 20 1 33 18 17 170
Capitalized into Inventory [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
Total stock-based compensation expense $ 11 $ 14 $ 3 $ 75