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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net loss $ (16,555) $ (16,225)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 139 175
Stock-based compensation 1,735 2,358
Impairment of goodwill 7,268  
Deferred rent (17)  
Non-cash interest expense   55
Non-cash debt issuance expense   3
Gain on disposal of property and equipment (1)  
Fair value adjustment on derivative liability   (1)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (243) (218)
Accounts payable (24) 910
Accrued expenses (414) 347
Deferred revenue 15,775  
Net cash provided by (used in) operating activities 7,663 (12,596)
Cash flows from investing activities:    
Purchases of property and equipment (49) (8)
Net cash used in investing activities (49) (8)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of issuance costs 17,545 16,286
Proceeds from the exercise of pre-funded warrants 157 78
Term loan principal payments   (3,259)
End of term payments   (245)
Net cash provided by financing activities 17,702 12,860
Net increase in cash and cash equivalents 25,316 256
Cash, cash equivalents and restricted cash — beginning of period 2,767 3,754
Cash, cash equivalents and restricted cash — end of period $ 28,083 $ 4,010