Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (40,113)	$ (15,429)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	368	359
Stock-based compensation	6,017	743
Change in fair value of warrant liability		156
Gain on asset disposal	(28)
Amortization of operating lease right-of-use assets	851
Net accretion and amortization of marketable securities	568
Loss on extinguishment of debt	200
Amortization of debt issuance costs	48	55
Other non-cash items	500
Changes in operating assets and liabilities:
Prepaid expenses and other assets	1,083	(91)
Accounts payable	287	(692)
Accrued expenses and other liabilities	(310)	72
Operating lease liabilities	(577)
Deferred revenue		(1,125)
Deferred rent		(4)
Net cash used in operating activities	(31,106)	(15,956)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(1,276)	(401)
Purchases of marketable securities	(110,112)	(26,956)
Proceeds from maturities of marketable securities	46,061
Net cash used in investing activities	(65,327)	(27,357)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on term loan	(2,644)
Proceeds from debt financing, net of debt issuance costs		2,416
Payments of Series C issuance costs	(192)	(2,628)
Proceeds from stock option exercises	84
Payments of debt issuance costs	(24)
Payments on capital lease obligations		(65)
Payments for tax distributions		(45)
Payments of deferred offering costs		(348)
Net cash used in financing activities	(2,776)	(670)
Net decrease in cash, cash equivalents and restricted cash	(99,209)	(43,983)
Cash, cash equivalents and restricted cash at beginning of period	116,174	59,836
Cash, cash equivalents and restricted cash at end of period	16,965	15,853
SUPPLEMENTAL NON-CASH OPERATING INFORMATION:
Right-of-use assets obtained in exchange for lease liabilities	14,477
SUPPLEMENTAL NON-CASH INVESTING AND FINANCING INFORMATION:
Property and equipment additions included in accounts payable and accrued liabilities	762	34
Deferred offering costs included in accounts payable and accrued liabilities		950
Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets:
Cash and cash equivalents	16,767	15,506
Restricted cash	198	347
Total cash, cash equivalents and restricted cash	$ 16,965	$ 15,853