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Equity-Based Compensation - Schedule of Compensation Expense (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 [Line Items]            
Share-based compensation expense $ 362 $ 167 $ 1,104 $ 507 $ 682 $ 370
Research and development expense            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense 43 40 129 119 160 68
General and administrative expense            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense $ 319 $ 127 $ 975 $ 388 $ 522 $ 302