Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (58,160)	$ (39,341)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	2,301	790
Stock-based compensation expense	4,161	3,099
Gain on extinguishment of PPP Loan	(1,808)	0
(Gain) loss on sale of property and equipment	(28)	13
Other non-cash operating lease cost	913	0
Changes in operating assets and liabilities:
Accounts receivable	540	143
Due from related party	61	3,507
Prepaid expenses and other current assets	(3,217)	(3,665)
Other non-current assets	(4,689)	0
Accounts payable	2,261	440
Accrued expenses and other current liabilities	5,435	481
Due to related party	(266)	(68)
Deferred revenue	(13,631)	2,963
Deferred rent	0	309
Operating lease liabilities	(1,006)	0
Net cash used in operating activities	(67,133)	(31,329)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(15,983)	(2,633)
Proceeds from sale of property and equipment	62	0
Net cash used in investing activities	(15,921)	(2,633)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from initial public offering, net of underwriting discounts, commissions and offering costs	118,576	0
Proceeds from issuance of Series D convertible preferred stock	0	90,000
Payment of Series D redeemable convertible preferred stock issuance costs	0	(96)
Proceeds from underwriters' exercise of overallotment option, net of underwriting discounts and commissions and initial public offering costs	3,049	0
Principal payments on finance lease obligation	(27)	(47)
Proceeds from exercise of stock options, net	171	59
Proceeds from PPP Loan	0	1,808
Payment of deferred offering costs	(2,659)	(249)
Net cash provided by financing activities	119,110	91,475
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	36,056	57,513
Cash, cash equivalents and restricted cash at beginning of period	99,909	42,396
Cash, cash equivalents and restricted cash at end of period	135,965	99,909
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	9	11
Cash paid in connection with operating lease liabilities	1,434	0
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Property and equipment in accounts payable and accrued liabilities	381	1,398
Conversion of redeemable convertible preferred stock into common stock	233,053	0
Operating right-of-use assets obtained in exchange for new operating leases upon adoption of ASC 842	5,965	0
Deferred initial public offering costs in AP and accruals	$ 0	$ 764