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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (2,864) $ (11,135)
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation expense 365 805
Changes in operating assets and liabilities:    
Accounts receivable 0 96
Prepaid expenses 326 (239)
Other current assets 0 109
Operating lease assets 0 93
Other assets 0 182
Accounts payable (547) (1,106)
Accrued research and development costs 7 (1,655)
Accrued expenses and other current liabilities (264) 81
Net cash used in operating activities (2,977) (12,769)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Net cash provided by investing activities 0 0
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from stock purchase agreement 0 5,000
Proceeds from exercises of stock options and ESPP 0 24
Net cash provided by financing activities 0 5,024
Effect of exchange rate changes on cash and cash equivalents (6) 4
Net decrease in cash and cash equivalents (2,983) (7,741)
Cash and cash equivalents, beginning of period 7,571 13,382
Cash and cash equivalents, end of period $ 4,588 $ 5,641