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Condensed Consolidated Statements of Cash Flows - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities:    
Net loss $ (8,946,000) $ (12,487,000)
Adjustment to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 7,000 5,000
Change in fair value of warrant liabilities 209,000 119,000
Stock compensation expense 125,000 185,000
Changes in assets and liabilities:    
Receivables 10,000 57,000
Prepaid expenses and other current assets 265,000 (70,000)
Other assets 10,000  
Accounts payable (543,000) 877,000
Accrued expenses and other current liabilities (1,979,000) (418,000)
Deferred revenue (113,000) (112,000)
Net cash used in operating activities (10,955,000) (11,844,000)
Investing activities:    
Payments for purchase of property and equipment   (15,000)
Net cash used in investing activities   (15,000)
Financing activities:    
Proceeds from the sale of common stock and warrants, net of costs 35,147,000 9,062,000
Proceeds from the exercise of warrants 480,000 7,298,000
Proceeds from the exercise of stock options 24,000  
Net cash provided by financing activities 35,651,000 16,360,000
Effect of foreign currency translation on cash (12,000) 1,000
Net increase in cash and cash equivalents 24,684,000 4,502,000
Cash and cash equivalents at beginning of period 19,025,000 22,726,000
Cash and cash equivalents at end of period $ 43,709,000 $ 27,228,000