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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Cash flows from operating activities:      
Net loss $ (3,661) $ (3,820)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation of property and equipment 11 10  
Redeemable warrants valuation adjustment (31)  
Amortization of patent, trademark rights 36 19 $ 218
Changes in ROU assets 37 5  
Loss on available for sale marketable securities 19  
Gain from sale of income tax operating losses (255) (190)  
Equity-based compensation 82 242  
Unrealized loss (gain) on marketable securities (203) 915  
Change in assets and liabilities:      
Prepaid expenses and other current assets and other non current assets (180) 8  
Lease liability (23) (5)  
Accounts payable 586 180  
Accrued expenses (110) (110)  
Net cash used in operating activities (3,680) (2,758)  
Cash flows from investing activities:      
Proceeds from sale of marketable securities 598 407  
Purchase of patent and trademark rights 7 (33)  
Purchase of marketable securities (712) (720)  
Proceeds from sales of property and equipment 29  
Net cash used in investing activities (78) (346)  
Cash flows from financing activities:      
Proceeds from sale of stock, net of issuance costs 100  
Net cash provided by financing activities 100  
Net decrease in cash and cash equivalents (3,658) (3,104)  
Cash and cash equivalents at beginning of period 27,053 32,093 32,093
Cash and cash equivalents at end of period 23,395 28,989 $ 27,053
Supplemental disclosures of non-cash investing and financing cash flow information:      
Conversion of Series B preferred $ 4