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Stockholders’ Deficit - Share Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Payment Arrangement, Additional Disclosure [Abstract]        
Total stock-based compensation expense $ 1,680 $ 796 $ 3,209 $ 2,304
Cost of services        
Share-based Payment Arrangement, Additional Disclosure [Abstract]        
Total stock-based compensation expense 192 22 317 60
Selling and marketing        
Share-based Payment Arrangement, Additional Disclosure [Abstract]        
Total stock-based compensation expense 355 90 617 266
General and administrative        
Share-based Payment Arrangement, Additional Disclosure [Abstract]        
Total stock-based compensation expense $ 1,133 $ 684 $ 2,275 $ 1,978