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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities    
Net loss $ (5,413,000) $ (4,565,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 44,000 44,000
Non-cash stock-based compensation 753,000 38,000
Amortization of financing lease right-of-use assets 250,000 0
Amortization of operating lease right-of-use assets 61,000 0
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (62,000) 8,000
Other non-current assets 0 (1,000)
Accounts payable (372,000) 1,000
Accrued expenses and other current liabilities (221,000) 1,191,000
Short-term operating lease liabilities 62,000 0
Long-term operating lease liabilities (70,000) 0
Net cash used in operating activities (4,968,000) (3,284,000)
Financing activities    
Proceeds from the issuance of common stock - Class A 0 200,000
Proceeds from issuance of preferred stock - Series A, net of $16 of issuance costs 0 5,480,000
Principal payments on financing leases (248,000) 0
Proceeds from issuance of loan 0 174,000
Deferred offering costs paid (779,000) 0
Net cash (used in) provided by financing activities (1,027,000) 5,854,000
Net (decrease) increase in cash and restricted cash (5,995,000) 2,570,000
Cash and restricted cash at beginning of period 17,994,000 610,000
Cash and restricted cash at end of period 11,999,000 3,180,000
Supplemental disclosure of non-cash financing and investing information:    
Deferred offering costs included in accounts payable and accrued expenses 1,020,000 0
Initial measurement of operating lease right-of-use assets and liabilities $ 3,483,000 $ 0