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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating activities    
Net loss $ (16,011,000) $ (14,065,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 9,000 11,000
Amortization of operating lease asset 173,000  
Goodwill impairment 1,867,000 0
Stock-based compensation 1,308,000 1,543,000
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 354,000 (476,000)
Accounts payable and accrued expenses (1,392,000) 1,094,000
Operating lease liability (165,000)  
Net cash used in operating activities (13,857,000) (11,893,000)
Financing activities    
Proceeds from issuances of common stock, net 9,676,000 7,491,000
Proceeds from exercise of stock options   71,000
Net cash provided by financing activities 9,676,000 7,562,000
Net decrease in cash and cash equivalents (4,181,000) (4,331,000)
Cash and cash equivalents at beginning of year 12,972,000 17,303,000
Cash and cash equivalents at end of year $ 8,791,000 $ 12,972,000