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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (14,347) $ (14,969)
Adjustment to reconcile net loss to net cash used in operating activities:    
Gain on extinguishment of debt (766) 0
Non-cash interest expense 134 258
Deferred taxes 49 7
Loss on extinguishment of payables 0 634
Non-cash stock-based compensation 284 3,776
Amortization of research and development expense   257
Fair value of common stock issued in exchange for services 0 325
Fair value of common stock issued in connection with litigation settlements 1,250 0
Change in fair value of common stock warrants (5,340) 0
Change in fair value of contingent consideration 4,025 0
Loss on settlement of liability-classified warrants 727 0
Changes in operating assets and liabilities:    
Other receivable (6,600) 0
Prepaid expenses and other assets (538) 3
Litigation settlement insurance recovery (474) 0
Accounts payable (4,453) 377
Accrued expenses and other current liabilities 182 85
Net cash used in operating activities (25,867) (9,247)
Cash flows from financing activities:    
Net proceeds from issuance of Series A convertible preferred stock and common stock warrants 9,647 0
Proceeds from issuance of common stock 21,564 6,007
Dividends paid (487) 0
Principal payments on long-term debt (7,525) (353)
Net cash provided by financing activities 23,199 5,654
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents (2,668) (3,593)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at the beginning of period 12,750 5,962
Cash, cash equivalents, restricted cash, and restricted cash equivalents at the end of period 10,082 2,369
Supplemental disclosure of cash flow information:    
Cash received during the periods for interest 166 0
Cash paid during the periods for interest 321 0
Supplemental disclosure of non-cash investing and financing activities:    
Fair value of liability-classified warrants issued in connection with Series A convertible preferred stock recorded as issuance cost 5,039  
Repayment of interest and principal on long-term debt through issuance of common stock 3,587 0
Reclassification of warrant liabilities upon exchange for shares of common stock 285 0
Impact of anti-dilution protection on liability-classified warrants 491 0
Debt issued in connection with warrant exchange agreements $ 966 $ 0