Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net loss	$ (115,867)	$ (29,864)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	6,869	4,248
Non-cash research and development arrangements	390	390
Stock-based compensation	38,549	22,561
Change in fair value of warrant liabilities	26,787	(28,358)
Amortization of premiums and accretion of discounts on available-for-sale securities	(7,287)	(383)
Other, net	1,036	345
Changes in operating assets and liabilities:
Accounts receivable	946	(1,135)
Prepaid expenses and other current assets	(7,545)	(1,842)
Accounts payable	975	2,992
Accrued expenses	8,066	1,996
Unearned revenue	(4,944)	(555)
Other assets and liabilities	(156)	(180)
Net cash used in operating activities	(52,181)	(29,785)
Cash flows from investing activities:
Purchases of property and equipment	(6,544)	(8,381)
Capitalized software development costs	(3,134)	(1,491)
Intangible asset acquisition costs	(1,057)	(598)
Purchases of available-for-sale securities	(230,350)	(488,887)
Maturities and sales of available-for-sale securities	285,665	185,150
Net cash provided by (used in) investing activities	44,580	(314,207)
Cash flows from financing activities:
Proceeds from stock options exercised	775	953
Other financing, net	9	1,212
Net cash provided by financing activities	784	2,165
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	3	0
Net change in cash, cash equivalents and restricted cash	(6,814)	(341,827)
Cash, cash equivalents and restricted cash at the beginning of the period	46,367	399,025
Cash, cash equivalents and restricted cash at the end of the period	39,553	57,198
Supplemental disclosures of non-cash investing and financing transactions:
Property and equipment purchases in accounts payable and accrued expenses	4,202	186
Intangible asset purchases in accounts payable and accrued expenses	321	256
Operating lease right-of-use assets subject to lease liability	2,380	0
Noncash reclassification of warrant liabilities to equity upon exercise	7	8
Bonus settled in restricted stock units	$ 2,641	$ 473