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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Statement of Cash Flows [Abstract]        
Net loss $ (8,937) $ (11,299) $ (16,941) $ (13,151)
Adjustments to reconcile net loss to cash used in operating activities:        
Depreciation and amortization 159 132 180 133
Equity-based compensation 1,104 507 682 370
Amortization of long-term debt issuance costs and fees 150 137 193 0
Change in fair value of warrant liabilities (201) 67 67 0
Changes in operating assets and liabilities:        
Unbilled revenue receivable and accounts receivable (201) 237 237 316
Receivable from related party 2 49 42 38
Prepaid expenses and other current assets (727) (151) (244) (128)
Accounts payable 1,361 (359) (126) (18)
Accrued Northwestern University License Agreements fee     1,500 0
Accrued legal expenses     45 29
Accrued payroll-related expenses     (76) 268
Other accrued expenses     79 (63)
Accrued expenses and other current liabilities (948) 2    
Deferred revenue (6,207) 0 9,310 0
Other noncurrent liabilities (2) 1 2 4
Net cash used in operating activities (14,447) (10,677) (5,050) (12,202)
Cash flows from investing activities:        
Capital expenditures (726) (315) (394) (12)
Net cash used in investing activities (726) (315) (394) (12)
Cash flows from financing activities:        
Proceeds from common stock offering 20,302 0    
Proceeds from preferred stock offering 0 450 450 19,672
Proceeds from long-term borrowing 0 6,000 6,000 0
Proceeds from exercise of common stock options 43 26 33 53
Repayment of long-term debt (595) 0    
Payment of long-term debt fees and issuance costs 0 (141) (141) 0
Payment of common stock financing costs (1,264) 0    
Payment of preferred stock financing costs 0 (6) (6) (112)
Net cash provided by financing activities 18,486 6,329 6,336 19,613
Net increase (decrease) in cash and cash equivalents 3,313 (4,663) 892 7,399
Cash and cash equivalents - beginning of period 19,623 18,731 18,731 11,332
Cash and cash equivalents - end of period 22,936 14,068 19,623 18,731
Non-cash financing activities:        
Common stock issuance costs (accounts payable and accrued expenses) 1,773 0    
Issuance of common stock warrants 211 0    
Issuance of preferred stock warrants 0 134 134 0
Debt issuance costs (accounts payable) $ 0 $ 231 231 0
Non-cash investing activities (capital expenditure) included in other accrued expenses     $ (11) $ (107)