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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 FROM OPERATING ACTIVITIES:    
Net loss $ (2,675) $ (66,400)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss on impairment of goodwill 0 56,086
Depreciation and amortization 522 1,444
Stock-based compensation 6 1,394
Change in fair value of royalties payable 86 0
Accretion of royalties payable 0 513
Changes in operating assets and liabilities:    
Accounts receivable 64 (9)
Inventories (19) (18)
Prepaid expenses and other assets 88 612
Lease right-of-use assets and lease liabilities 0 5
Accounts payable 79 (434)
Accrued expenses (93) (5,051)
Accrued interest - related parties 0 (198)
Other non-current assets 0 3
Net cash used in operating activities (1,942) (12,053)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (22) (37)
Cash acquired as part of business combination 0 15
Net cash used in investing activities (22) (22)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock and warrants 0 179
Payments on note payable (110) 0
Proceeds from exercise of warrants 0 1,326
Payments of costs related to exercise of warrants 0 (181)
Payments of convertible promissory notes 0 (250)
Proceeds from the private placement of securities 0 8,000
Payments of offering costs related to the private placement of securities 0 (640)
Net cash (used in) provided by financing activities (110) 8,434
NET CHANGE IN CASH AND CASH EQUIVALENTS (2,074) (3,641)
CASH AND CASH EQUIVALENTS, beginning of period 3,565 15,859
CASH AND CASH EQUIVALENTS, end of period 1,491 12,218
SUPPLEMENTAL CASH FLOW INFORMATION    
Non-cash consideration for Catheter acquisition 0 82,925
Cash payments for interest $ 3 $ 181