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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (1,429) $ (10,171)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 14 479
Equity-based compensation 11 1,277
Amortization of right-of-use asset 390 364
Other 0 44
Changes in operating assets and liabilities:    
Other receivable (544) 0
Prepaid expenses and other current assets 415 145
Other noncurrent assets 0 288
Accounts payable (46) (18)
Accrued expenses (32) (190)
Other liabilities (395) (347)
Net cash used in operating activities (1,616) (8,129)
Cash flows from investing activities:    
Purchase of available-for-sale securities 0 (2,000)
Proceeds from sale of property and equipment 0 211
Net cash used in investing activities 0 (1,789)
Cash flows from financing activities:    
Proceeds from short-term borrowing 1,000 0
Proceeds from common stock offering 0 5,440
Payment of common stock financing costs 0 (843)
Payment of exercise of common stock warrants 0 (800)
Payments for minimum statutory tax withholding related to net share settlement of equity awards 0 (121)
Net cash provided by provided by financing activities 1,000 3,676
Net (decrease) in cash, cash equivalents, and restricted cash (616) (6,242)
Cash, cash equivalents, and restricted cash - beginning of period 2,016 9,777
Cash, cash equivalents, and restricted cash - end of period $ 1,400 $ 3,535