CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating activities
Net loss	$ (48,557)	$ (40,928)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	11,968	9,385
Lease Impairment Charge	4,925	0
Depreciation and amortization	1,461	879
Premiums and discounts on available-for-sale marketable securities	(3,072)	(1,326)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(3,005)	(1,641)
Accounts Receivable	15,000	0
Contract asset	1,732	(783)
Accounts payable	75	2,217
Accrued expenses and other current liabilities	(15,394)	(10,037)
Deferred revenue	(8,257)	(6,145)
Operating lease right-of-use assets	619	1,138
Operating lease liabilities	2,636	2,915
Other assets and liabilities	278	358
Net cash used in operating activities	(39,591)	(43,968)
Investing activities
Purchase of property and equipment, net	(7,402)	(4,009)
Purchases of investments	(422,704)	(61,835)
Maturities of investments	99,499	90,428
Net cash provided by investing activities	(330,607)	24,584
Financing activities
Proceeds from issuance of common stock and accompanying pre-funded warrants from public offering, net of underwriting discounts and issuance costs	301,373	0
Proceeds from issuance of common stock through at-the market sales agreement, net of issuance costs	48,740	0
Proceeds from stock option exercises	3,933	1,486
Payments on finance leases	(290)	(327)
Net cash provided by financing activities	353,756	1,159
Net increase in cash, cash equivalents and restricted cash	(16,442)	(18,225)
Cash, cash equivalents and restricted cash at beginning of period	115,777	74,524
Cash, cash equivalents and restricted cash at end of period	99,335	56,299
Supplemental disclosure of cash flow activities
Right-of-use assets obtained in exchange for new operating lease liabilities	0	48,833
Cash paid for interest	49	52
Supplemental disclosure of noncash investing and financing activities
Property and equipment purchases included in accounts payable and accrued expenses	1,205	1,100
Cash and cash equivalents	93,510	50,152
Restricted cash	5,825	6,147
Total cash, cash equivalents, and restricted cash	$ 99,335	$ 56,299