Unaudited Consolidated Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (24,642)	$ (11,312)
Adjustment to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization expense	705	218
Stock-based compensation expense	265	89
Reduction in the operating right of use assets	1,329	381
Amortization of debt discount	1,283	623
Change in fair value of derivative liability	84	557
Accretion on marketable securities	(163)
Non-cash interest expense	41	59
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(1,623)	(1,607)
Accounts payable	2,823	2,612
Accrued expenses	(4,445)	(2,259)
Deferred revenue	(323)	45,619
Operating lease liabilities	(868)	(376)
Net cash (used in) provided by operating activities	(25,534)	34,604
Cash flows from investing activities:
Purchase of marketable securities	(34,460)	(63,244)
Proceeds from the sale of marketable securities	31,000
Purchases of property and equipment	(135)	(1,007)
Net cash used in investing activities	(3,595)	(64,251)
Cash flows from financing activities:
Cash, cash equivalents and restricted cash acquired in connection with the reverse recapitalization	37,903
Payment of reverse recapitalization finance costs	(1,742)
Proceeds from the issuance of common stock in pre-closing financing	30,640
Payment of principal related to finance lease liabilities	(106)
Proceeds from failed sale-leaseback arrangement	1,092
Payment of finance liability from failed sale-leaseback arrangement	(45)
Proceeds from issuance of convertible promissory note		35,000
Net cash provided by financing activities	67,742	35,000
Net increase in cash and cash equivalents	38,613	5,353
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	62,807	33,904
Supplemental disclosures of cash flow information
Cash paid for interest	45
Supplemental disclosure of non-cash financing and investing activities
Conversion of convertible preferred stock and non-controlling interests upon Merger	122,204
Conversion of convertible promissory note, accrued interest and derivative liability upon Merger	42,447
Reverse recapitalization costs in accrued expenses	4,071
Unrealized gain (loss) on marketable securities	177	(158)
Right-of-use assets obtained in exchange for new operating lease liabilities		3,072
Allocation of debt proceeds to derivative liability		3,820
Property and equipment in accounts payable	$ 49	$ 103