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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:    
Net loss $ (9,889) $ (6,324)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 644 147
Amortization on leasehold improvements 6 9
Gain on change in fair value of derivative liability (118)
Gain on loan extinguishment from PPP loan (140)
Loss on loan extinguishment 78
Amortization of debt discount and issuance costs 697
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 264 (970)
Accounts payable 9 363
Accrued expenses 155 342
Net cash used in operating activities (8,811) (5,916)
Cash flows from investing activities:    
Purchases of marketable securities (8,000)
Proceeds from maturities of marketable securities 5,968
Expenditures for leasehold improvements (15)
Net cash used in investing activities (2,032) (15)
Cash flows from financing activities:    
Net proceeds from issuance of common stock upon initial public offering 14,563
Proceeds from exercise of warrants 2,681
Proceeds from convertible notes 1,977
Proceeds from exercise of stock options 42 107
Net cash provided by financing activities 42 19,328
Net (decrease) increase in cash and cash equivalents (10,801) 13,397
Cash and cash equivalents:    
Beginning of year 15,192 1,795
End of year 4,391 15,192
Supplemental cash flow data:    
Derivative liability 738
Conversion of convertible preferred stock upon IPO 12,451
Conversion of convertible notes upon IPO $ 5,279