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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (6,932) $ (5,608)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation 35 1
Stock-based compensation 715 355
Noncash lease expense (3)  
Accretion of debt discount on convertible promissory notes   772
Accrued interest on convertible promissory notes   115
Accretion of discount on short-term investments 62
Non-employee services under convertible promissory notes 50
Compensation of non-employee services upon issuance of common stock 74
Change in fair value of derivative liability (121)
Change in fair value of warrant liability 1,581
Changes in operating assets and liabilities:    
Payroll tax credit 1
Prepaid expenses and other current assets 1,079 (1,425)
Other assets (762) (46)
Accounts payable 338 125
Other current and noncurrent liabilities (315) 87
Net cash used in operating activities (5,782) (4,040)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (42) (11)
Maturities of short-term investments 6,591
Net cash provided by (used in) investing activities 6,549 (11)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Issuance of common stock 76
Proceeds from issuance of shares upon Initial Public Offering - net of issuance costs 45,019
Net cash provided by financing activities   45,095
Net increase in cash and cash equivalents 767 41,044
Cash and cash equivalents at beginning of period 17,675 5,710
Cash and cash equivalents at end of period 18,442 46,754
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Accretion of Series A redeemable convertible preferred stock   686
Accretion of Series B redeemable convertible preferred stock   1,803
Conversion of preferred stock to common stock upon initial public offering   35,307
Reclassification of liability-classified warrants upon initial public offering   3,130
Issuance of underwriter warrants upon initial public offering   2,349
Issuance of convertible promissory notes for completion of non-employee services   500
Beneficial conversion feature upon issuance of convertible promissory note   471
Conversion of convertible promissory notes upon initial public offering   12,550
Vesting of common stock issued upon early exercise $ 40 38
Issuance of common stock for non-employee services   11
Reclassification of deferred offering costs upon initial public offering   497
Initial public offering expenses in accrued expenses   244
Initial public offering expenses in accounts payable   $ 4