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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (7,096) $ (6,932)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 38 35
Stock-based compensation 724 715
Noncash lease expense (3) (3)
Accretion of discount on short-term investments 62
Changes in operating assets and liabilities:    
Payroll tax credit 90 1
Prepaid expenses and other current assets (161) 1,079
Other assets (762)
Accounts payable (53) 338
Other current and noncurrent liabilities 381 (315)
Net cash used in operating activities (6,080) (5,782)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (13) (42)
Maturities of short-term investments 6,591
Net cash provided by (used in) investing activities (13) 6,549
CASH FLOWS FROM FINANCING ACTIVITIES:    
Issuance of common stock upon public offering, net of issuance costs 6,689
Issuance of common stock, net of issuance costs 2,805
Issuance of common stock upon exercise of stock options 109
Net cash provided by financing activities 9,603
Net increase in cash and cash equivalents 3,510 767
Cash and cash equivalents at beginning of period 10,759 17,675
Cash and cash equivalents at end of period 14,269 18,442
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Vesting of common stock issued upon early exercise 34 40
Unpaid issuance costs recorded in accounts payable 36
Issuance of warrants upon public offering $ 1,473