CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net loss	$ (181,377)	$ (145,510)	$ (23,605)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	11,133	1,609	711
Stock-based compensation	60,331	23,757	1,237
Accretion of unamortized debt discount and amortization of debt issuance costs	149	558	2,139
Change in fair value	0	21,463	(3,649)
Impairment charges	634	3,573	0
Deferred income taxes	(19,233)	0	0
Change in fair value of common stock warrant liabilities	(87,922)	23,049	0
Changes in operating assets and liabilities:
Accounts receivable, net	203	0	0
Prepaid expenses and other assets	(6,284)	(7,505)	(4,307)
Operating lease right-of-use assets	(14,511)
Accounts payable	6,261	10,729	(54)
Accrued professional fees	(3,739)	0	0
Loss contingency accrual	11,557	0	0
Operating lease liabilities	15,677
Other accruals and liabilities	26,967	12,045	5,591
Net cash used in operating activities	(180,154)	(56,232)	(21,937)
Investing Activities
Purchases of property and equipment, including internal-use software	(3,236)	(3,246)	(3,223)
Investment in non-marketable equity securities	(54,769)	0	0
Purchases of marketable securities	(504,032)	0	0
Proceeds from sales of marketable securities	2,100	0	0
Cash paid for business acquisition, net of cash acquired	(83,987)	0	0
Net cash used in investing activities	(643,924)	(3,246)	(3,223)
Financing Activities
Principal payments on finance leases obligations	(1,582)
Borrowings under debt agreements, net of issuance costs	280,897	0	9,563
Payments for debt issuance costs	(3)	(201)	0
Payments under debt agreements	0	(10,000)	(3,500)
Proceeds from issuance of common stock in follow-on offering, net of underwriting commissions, and offering costs	402,138	0	0
Net cash contributions from Business Combination and PIPE Financing	0	246,484	0
Payments made towards offering costs	(13,222)	(1,993)	0
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs	0	76,617	24,908
Net proceeds from exercise of stock options and issuance of common stock	3,883	1,243	197
Proceeds from exercise of common stock warrants, net of redemptions	130,571	382	0
Taxes paid related to net share settlement of equity awards	0	(13,404)	0
Payments made to repurchase common stock	0	(1,339)	0
Payments for redemption of preferred stock	0	(1,211)	0
Net cash provided by financing activities	802,682	296,578	31,168
Net change in cash, cash equivalents and restricted cash	(21,396)	237,100	6,008
Cash, cash equivalents and restricted cash – beginning of year	265,648	28,548	22,540
Cash, cash equivalents and restricted cash – end of year	244,252	265,648	28,548
Cash paid during the period for:
Interest	180	815	269
Noncash investing and financing activities:
Carrying value of long-term debt and accrued interest converted to redeemable convertible preferred stock	0	0	14,852
Settlement of the Redeemable convertible Series E preferred stock forward contract liability	0	21,688	0
Deferred offering costs and issuance costs in accounts payable and accrued liabilities	2,004	14,065	0
Issuance of common stock for business combination	67,051	0	0
Warrant liability reclassified to additional paid-in capital	84,016	0	0
Payment of promissory notes through surrender of shares	$ 0	$ 18,673	$ 0