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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities:    
Net loss $ (730) $ (380)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 7 6
Amortization of right of use lease asset 9 10
Unrealized gain on marketable equity securities (8) (329)
Unrealized gain on short-term investments 0 (21)
Stock-based compensation expense 59 67
Changes in operating assets and liabilities:    
Prepaid expenses and other 68 12
Accounts payable and other current liabilities (396) (50)
Net cash used in operating activities (991) (685)
Investing activities:    
Sale of short-term investments, net 918 809
Net cash provided by investing activities 918 809
Financing activities:    
Issuance of common stock upon exercise of stock options 14 0
Net cash provided by financing activities 14 0
Net (decrease) increase in cash and cash equivalents (59) 124
Cash and cash equivalents, beginning of period 200 316
Cash and cash equivalents, end of period $ 141 $ 440