v3.19.3
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:        
Net loss $ (9,033,000) $ (4,451,000) $ (5,985,000) $ (11,561,000)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation expense 5,000 6,000 8,000 10,000
Stock-based compensation expense 252,000 225,000 309,000 301,000
Changes in fair value of warrant liability 94,000   98,000 (12,000)
Changes in fair value of derivative liability   (211,000)    
Accretion of final charge upon maturity of Oxford Term Loan A and B 187,000 161,000 224,000 106,000
Amortization of issuance cost and discounts for term loans and convertible notes 20,000 258,000 40,000 54,000
Non-cash interest expense on convertible promissory notes 2,426,000 62,000 126,000 0
Amortization of right-of-use asset 232,000      
Changes in operating assets and liabilities:        
Prepaid expenses and other current assets (1,948,000) 13,000 23,000 329,000
Other assets 57,000   0 1,000
Accounts payable 2,168,000 (570,000) (212,000) 601,000
Accrued liabilities 1,006,000 (142,000) (650,000) (12,000)
Lease liability (233,000)      
Net cash used in operating activities (4,767,000) (4,649,000) (6,019,000) (10,183,000)
Cash flows from investing activities:        
Purchases of property and equipment   (2,000) (5,000) (3,000)
Net cash used in investing activities   (2,000) (5,000) (3,000)
Cash flows from financing activities:        
Payments on term loan (1,437,000) (890,000) (890,000) (139,000)
Proceeds from exercise of warrants     0 80,000
Proceeds from issuance of convertible promissory notes - related party 4,846,000 3,000,000 4,500,000 0
Net cash provided by financing activities 3,409,000 2,110,000 3,610,000 (59,000)
Net decrease in cash, cash equivalents and restricted cash (1,358,000) (2,541,000) (2,414,000) (10,245,000)
Cash, cash equivalents and restricted cash at beginning of period 1,942,000 4,356,000 4,356,000 14,601,000
Cash, cash equivalents and restricted cash at end of period 584,000 1,815,000 1,942,000 4,356,000
Other supplemental disclosure:        
Cash paid for interest 231,000 286,000 376,000 355,000
Non-cash investing and financing activities:        
Right-of-use assets obtained in exchange for operating lease obligations(1) 227,000      
Reclassification of warrant liability to paid in capital 234,000      
Conversion of convertible preferred stock into common stock 34,015,000      
Conversion of convertible notes and accrued interest into convertible preferred stock 3,203,000      
Reconciliation of cash, cash equivalents and restricted cash:        
Cash, cash equivalents and restricted cash at end of period $ 1,942,000 $ 4,356,000 $ 4,356,000 $ 14,601,000