CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net loss	$ (76,941)	$ (37,735)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	17,495	8,898
Depreciation and amortization	1,392	1,037
Premiums and discounts on available-for-sale marketable securities	1,852	2,511
Changes in operating assets and liabilities:
Prepaid expenses and other assets	630	(91)
Receivables—due from related parties		(327)
Contract asset—due from related parties	(2,234)	856
Accounts payable	(1,847)	4,005
Accrued expenses and other current liabilities	(1,720)	4,092
Deferred revenue	(17,503)	(35,455)
Operating lease right-of-use assets	245	197
Operating lease liabilities	(479)	(579)
Other assets and liabilities	(170)	(743)
Net cash (used in) provided by operating activities	(79,280)	(53,334)
Investing activities
Purchase of property and equipment, net	(1,217)	(790)
Purchases of investments	(144,827)	(46,164)
Maturities of investments	253,710	152,000
Net cash used in investing activities	107,666	105,046
Financing activities
Proceeds from stock option exercises	826	2,618
Proceeds from employee stock purchase plan	256	307
Payments of offering costs in connection with initial public offering		(397)
Payments on finance leases	(533)	(341)
Net cash provided by financing activities	549	2,187
Net (decrease) increase in cash, cash equivalents and restricted cash	28,935	53,899
Cash, cash equivalents and restricted cash at beginning of period	54,092	32,593
Cash, cash equivalents and restricted cash at end of period	83,027	86,492
Supplemental disclosure of cash flow activities
Cash paid for interest	86	54
Supplemental disclosure of noncash investing and financing activities
Property and equipment purchases included in accounts payable and accrued expenses	745	320
Purchase of property and equipment through finance lease	340	1,231
Offering costs included in accrued expenses		154
Cash and cash equivalents	76,914	84,903
Restricted cash	6,113	1,589
Total cash, cash equivalents, and restricted cash	$ 83,027	$ 86,492