Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities
Net loss	$ (71,056)	$ (5,881)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,120	2,717
Non-cash research and development arrangements	260	260
Stock-based compensation	21,572	12,556
Change in fair value of warrant liabilities	19,147	(29,509)
Amortization of premiums and accretion of discounts on available-for-sale securities	(4,593)	108
Other, net	736	(1,726)
Changes in operating assets and liabilities:
Accounts receivable	2,074	(801)
Prepaid expenses and other current assets	(2,928)	3,576
Accounts payable	479	1,156
Accrued expenses	2,267	484
Unearned revenue	(2,005)	264
Other assets and liabilities	26	(133)
Net cash used in operating activities	(29,901)	(16,929)
Cash flows from investing activities:
Purchases of property and equipment	(2,411)	(7,022)
Capitalized software development costs	(1,950)	(982)
Intangible asset acquisition costs	(628)	(370)
Purchases of available-for-sale securities	(185,377)	(403,899)
Maturities and sales of available-for-sale securities	189,446	73,090
Net cash used in investing activities	(920)	(339,183)
Cash flows from financing activities:
Proceeds from stock options exercised	541	567
Other financing, net	(1)	488
Net cash provided by financing activities	540	1,055
Net change in cash, cash equivalents and restricted cash	(30,281)	(355,057)
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	16,086	43,968
Supplemental disclosures of non-cash investing and financing transactions:
Property and equipment purchases in accounts payable and accrued expenses	1,527	1,284
Intangible asset purchases in accounts payable and accrued expenses	243	73
Operating lease right-of-use assets subject to lease liability	2,239	0
Noncash reclassification of warrant liabilities to equity upon exercise	0	8
Bonus settled in restricted stock units	$ 2,500	$ 473