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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows used in operating activities:    
Net loss $ (3,552) $ (1,672)
Adjustments to reconcile net loss to net cash used in operating activities:    
Gain on change in fair value of Cizzle option (136)
Change in reserve for related party uncollectible loan 243
Loss on change in fair value of convertible notes payable 280
Unrealized foreign exchange loss 6
Issuance of warrants for lock-up 502
Gain on change in fair value of warrants (19)
Stock-based compensation expense 431
Non-cash interest expense 79 5
Operating lease obligations (25)  
Amortization of financed Directors and Officers insurance 422
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (153) (493)
Accounts payable (97)
Accrued expenses and other liabilities 49 (196)
Net cash flows used in operating activities (2,357) (1,970)
Cash flows used in investing activities:    
Issuance of loan - related party (243)
Net cash flows used in investing activities (243)
Cash flows provided by financing activities:    
Proceeds from issuance of convertible notes payable, carried at fair value 1,434
Proceeds from issuance of convertible promissory note payable, carried at cost 786
Net cash flows provided by financing activities 2,220
Net change in cash and cash equivalents before effect of exchange rate changes (2,357) 7
Effect of exchange rate changes on cash and cash equivalents (27) 1
Net change in cash (2,384) 8
Cash and cash equivalents at beginning of period 4,228
Cash and cash equivalents at end of period 1,844 8
Supplemental cash flow information:    
 Cash paid for interest 80
Non-cash investing and financing activities    
Right-of-use assets obtained in exchange for operating lease liabilities $ 350