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Stockholders’ Deficit - Stock Options - Vested (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]        
Fair value of options to purchase common stock vested $ 649 $ 571 $ 2,000 $ 3,100