CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
OPERATING CASH FLOW ACTIVITIES:
Net loss	$ (26,791)	$ (52,796)
Reconciliation of net loss to net cash used in operating activities
Depreciation	78	80
Accretion of debt discount and amortization of financing costs	43	333
Change in fair value of derivative liabilities	(30)	231
Stock-based compensation expense	3,433	4,877
Payable-in-kind interest on Credit Agreement	1,216	398
Operating lease right-of-use assets	75	70
Changes in operating assets and liabilities
Accounts receivable	(307)	(35)
Inventory	(448)	33
Prepaid expenses, other current assets and other assets	901	(2,006)
Accounts payable, accrued expenses, due to related parties, and other current liabilities	4,826	(4,654)
Accrued interest	(619)	1,193
Operating lease liabilities	(83)	(77)
Net cash used in operating activities	(17,706)	(52,353)
FINANCING CASH FLOW ACTIVITIES:
Proceeds from issuance of common stock and warrants	26,743	24,657
Offering costs for common stock and warrants issuance	(117)	(739)
Payment of employee tax obligations related to vesting restricted stock units		(27)
Exercise of stock options		258
Net cash provided by financing activities	26,626	24,149
Net increase (decrease) in cash and cash equivalents	8,920	(28,204)
Cash and cash equivalents, beginning of the period	65,221	193,725	$ 193,725
Cash and cash equivalents, end of the period	74,141	165,521	$ 65,221
Supplemental cash flow information:
Deferred initial public offering costs in accrued expenses		$ 596
Issuance of stock purchase warrants	$ 224