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Supplemental Balance Sheet Information - Accrued Expense and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Balance Sheet Information [Abstract]      
Accrued Northwestern University License Agreements fee (Note 11) $ 0 $ 1,500 $ 0
Accrued legal expenses 1,004 123 78
Accrued payroll-related expenses 513 423 499
Other accrued expenses 979 114 $ 131
Accrued expenses and other current liabilities $ 2,496 $ 2,160