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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (6,647) $ (5,416)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 39 21
Stock-based compensation 282 689
Amortization of right-of-use asset 502 41
Gain on disposal of fixed assets (2) 0
Accrued interest expense 407 0
Paid-in-kind interest expense 177 0
Amortization of debt discount and debt issuance costs 445 0
Change in fair value of warrant liabilities 70 45
Loss on non-controlling investment 0 51
Changes in operating assets and liabilities:    
Other receivables 74 304
Prepaid expenses and other current assets 807 813
Other non-current assets 0 (108)
Accounts payable and accrued expenses 461 (1,766)
Operating lease liability 123 (173)
Due to related party (437) (438)
Deferred revenue (48) 250
Other liabilities 0 (362)
Net cash used in operating activities (3,747) (6,049)
Cash flows from investing activities:    
Purchase of property and equipment (101) 0
Proceeds received from the sale of fixed assets 4 0
Net cash used in investing activities (97) 0
Cash flows from financing activities:    
Proceeds received from the convertible notes financing 1,405 0
Fees paid related to the convertible notes financing (20) 0
Net cash provided by financing activities 1,385 0
Net decrease in cash and cash equivalents (2,459) (6,049)
Cash, cash equivalents and restricted cash at beginning of period 11,670 15,541
Cash, cash equivalents and restricted cash at end of period 9,211 9,492
Cash paid during the period for:    
Interest 0 1
Income taxes 0 0
Supplemental disclosure of non-cash investing and financing activities:    
Note warrants issued 755 0
Unpaid fees incurred in connection with the convertible notes financing 46 0
Paid in-kind interest added to convertible notes principal 177 0
Adjustment to lease liability and ROU asset due to remeasurement 4,245 0
Property and equipment purchased but not paid 279 0
Reconciliation of cash, cash equivalents and restricted cash at end of period:    
Cash and cash equivalents 5,116 5,397
Restricted Cash 4,095 4,095
Total Cash, cash equivalents and restricted cash at end of period $ 9,211 $ 9,492