CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (158,765)	$ (104,220)
Adjustments to reconcile net loss to net cash flows used in operating activities:
Depreciation and amortization	2,341	664
Adjustments to operating lease expense	(495)	(400)
Equity-based compensation	18,706	11,321
Change in fair value of financing liabilities	(5,800)	992
Change in fair value of private placement warrants		2,171
Amortization of premiums and accretion of discounts on marketable securities	1,012
Changes in operating assets and liabilities, net:
Prepaid expenses and other current assets	3,331	2,270
Other assets	(240)	(757)
Accounts payable	464	1,485
Accrued expenses and other liabilities	14,142	1,325
Operating lease liability		3,123
Net cash flows used in operating activities	(125,304)	(82,026)
Cash flows from investing activities:
Purchases of marketable securities	(141,566)
Maturities and redemptions of marketable securities	170,647
Purchases of property and equipment	(3,329)	(8,243)
Net cash flows provided by (used in) investing activities	25,752	(8,243)
Cash flows from financing activities:
Proceeds from the exercise of stock options and ESPP purchases	5,170	2,571
Proceeds from financing liability, related party	18,750	15,625
Proceeds from financing liability	18,750	15,625
Deferred costs related to financing activities	(251)	(115)
Net cash flows provided by financing activities	42,419	33,706
Net decrease in cash, cash equivalents and restricted cash	(57,133)	(56,563)
Cash, cash equivalents and restricted cash, beginning of the period	197,218	387,823
Cash, cash equivalents and restricted cash, end of the period	140,085	331,260
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	138,218	327,060
Restricted cash	1,867	4,200
Total cash, cash equivalents and restricted cash	140,085	331,260
Supplemental cash flow disclosures from non-cash investing and financing activities:
Fixed asset additions included in accounts payable and other current liabilities	$ 349	655
Unpaid offering costs included in accounts payable and other current liabilities		$ 520