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Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities:    
Net loss $ (17,108,000) $ (15,557,000)
Adjustments required to reconcile net loss to net cash used in operating activities:    
Depreciation 892,000 840,000
Gain upon extinguishment of Paycheck Protection Program loan 722,000  
Stock-based compensation 2,218,000 2,613,000
Non-cash interest expense 60,000 457,000
Payment of accreted interest for deferred consideration for asset acquisition (586,000)  
Changes in operating assets and liabilities:    
Award receivable (690,000) (241,000)
Accounts payable and accrued liabilities (100,000) 492,000
Accrued compensation 1,151,000 (21,000)
Operating lease right-of-use asset and liability, net 145,000 611,000
Prepaid expenses and other current assets (237,000) (1,162,000)
Net cash used in operating activities (14,977,000) (11,968,000)
Investing activities:    
Purchases of property and equipment (1,076,000) (458,000)
Net cash used in investing activities (1,076,000) (458,000)
Financing activities:    
Principal payment of deferred consideration for asset acquisition (1,414,000) (1,000,000)
Proceeds from Paycheck Protection Program Loan   717,000
Proceeds from sale of common stock, net of offering costs 19,363,000 22,893,000
Proceeds from exercise of warrants and stock options 531,000 168,000
Net cash provided by financing activities 18,480,000 22,778,000
Net increase in cash, cash equivalents and restricted cash 2,427,000 10,352,000
Cash, cash equivalents and restricted cash, beginning of period 10,849,000 6,733,000
Cash, cash equivalents and restricted cash, end of period 13,276,000 17,085,000
Supplemental disclosure of cash flow information:    
Paycheck Protection Program loan forgiveness 722,000  
Unpaid offering costs   65,000
Property and equipment included in accounts payable $ 124,000 $ 145,000