Unaudited Consolidated Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net loss	$ (44,518)	$ (26,160)
Adjustment to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization expense	1,420	463
Stock-based compensation expense	595	147
Reduction in the operating right of use assets	2,683	1,620
Amortization of debt discount	1,283	1,305
Change in fair value of derivative liability	84	701
Accretion on marketable securities	(569)	0
Non-cash interest expense	68	4
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(1,210)	(1,324)
Accounts payable	659	674
Accrued expenses	(1,618)	(484)
Deferred revenue	(1,043)	45,447
Operating lease liabilities	(1,915)	(2,088)
Net cash (used in) provided by operating activities	(44,081)	20,305
Cash flows from investing activities:
Purchase of marketable securities	(34,460)	(42,103)
Proceeds from the sale of marketable securities	67,000	0
Purchases of property and equipment	(382)	(2,038)
Net cash provided by (used in) investing activities	32,158	(44,141)
Cash flows from financing activities:
Cash, cash equivalents and restricted cash acquired in connection with the reverse recapitalization	37,903	0
Payment of reverse recapitalization finance costs	(5,202)	0
Proceeds from the issuance of common stock in pre-closing financing	30,640	0
Payment of principal related to finance lease liabilities	(213)	(17)
Proceeds from failed sale-leaseback arrangement	1,020	0
Payment of finance liability from failed sale-leaseback arrangement	(88)	0
Proceeds from issuance of convertible promissory note	0	35,000
Proceeds from the exercise of stock options	52	0
Net cash provided by financing activities	64,112	34,983
Net increase in cash, cash equivalents and restricted cash	52,189	11,147
Cash, cash equivalents and restricted cash at beginning of the period	24,194	28,551
Cash, cash equivalents and restricted cash at end of the period	76,383	39,698
Supplemental disclosures of cash flow information:
Cash paid for interest	88	0
Supplemental disclosure of non-cash financing and investing activities:
Conversion of convertible preferred stock and non-controlling interests upon Merger	122,204	0
Conversion of convertible promissory note, accrued interest and derivative liability upon Merger	42,447	0
Reverse recapitalization costs in accrued expenses	611	0
Unrealized gain (loss) on marketable securities	306	(197)
Deferred financing costs in accounts payable	86	0
Deferred financing costs in accrued expenses	60	0
Right-of-use assets obtained in exchange for new operating lease liabilities	908	6,437
Right-of-use assets obtained in exchange for new financing lease liabilities	0	268
Allocation of debt proceeds to derivative liability	0	3,820
Property and equipment in accounts payable	$ 0	$ 993