CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 115,509	$ 25,617
Short-term investments	19,803	0
Prepaid expenses and other current assets	2,731	3,099
Total current assets	138,043	28,716
Equity method investment	4,724	0
Property and equipment, net	1,659	1,782
Right-of-use asset, operating leases	6,160	6,301
Restricted cash and restricted cash equivalents	647	5,647
Other noncurrent assets	1,101	4,611
Total assets	152,334	47,057
Current liabilities:
Accounts payable	4,960	3,468
Accrued expenses and other current liabilities	19,825	9,763
CVR liability	5,080	0
Venture debt, current portion	3,088	878
Total current liabilities	32,953	14,109
Lease liability, net of current portion	6,099	6,248
Venture debt, net of current portion	9,400	4,581
Convertible notes	0	38,595
Other noncurrent liabilities	55,113	55,000
Total liabilities	103,565	118,533
Commitments and contingencies (Note 10)
Temporary equity, convertible preferred stock	0	111,445
Stockholders' deficit:
Common stock, $0.0001 par value; 400,000,000 shares authorized, 11,929,520 and 359,569 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively	2	1
Additional paid-in capital	234,824	4,159
Accumulated other comprehensive loss	(5)	0
Accumulated deficit	(186,052)	(187,081)
Total stockholders' equity (deficit)	48,769	(182,921)
Total liabilities, convertible preferred stock and stockholders' deficit	152,334	47,057
Series A convertible preferred stock [Member]
Current liabilities:
Temporary equity, convertible preferred stock	0	47,458
Series A-1 convertible preferred stock [Member]
Current liabilities:
Temporary equity, convertible preferred stock	0	4,132
Series B convertible preferred stock [Member]
Current liabilities:
Temporary equity, convertible preferred stock	$ 0	$ 59,855