CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 74,141	$ 65,221
Accounts receivable, net	378	71
Inventory	2,439	1,991
Prepaid expenses	2,103	2,782
Other current assets	1,856	2,078
Total current assets	80,917	72,143
Property and equipment, net	706	784
Operating lease right-of-use assets	613	688
Other assets	87	87
Total assets	82,323	73,702
Current liabilities
Accounts payable	17,220	13,654
Accrued expenses	13,675	12,424
Accrued interest	117	736
Total current liabilities	31,481	27,267
Long-term portion of operating lease liabilities	350	440
Derivative liabilities	21,222	1,905
Long-term debt	101,633	100,598
Total liabilities	154,686	130,210
Commitments and contingencies (Note 16)
Stockholders' (deficit) equity
Preferred stock, $0.001 par value, 10,000 shares authorized; no shares issued and outstanding as of March 31, 2024 and December 31, 2023
Common stock, $0.001 par value, 100,000 shares authorized as of March 31, 2024 and December 31, 2023; 33,632 and 29,930 shares issued and outstanding as of March 31, 2024 and December 31, 2023, respectively	34	30
Additional paid-in-capital	544,992	534,060
Accumulated deficit	(617,389)	(590,598)
Total stockholders' (deficit) equity	(72,363)	(56,508)
Total liabilities and stockholders' (deficit) equity	82,323	73,702
Related Party
Current liabilities
Other current liabilities	116	107
Nonrelated Party
Current liabilities
Other current liabilities	$ 353	$ 346