Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net loss	$ (57,453)	$ (30,459)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	142	11
Non-cash lease costs	514	204
Stock-based compensation	11,337	4,037
Net amortization of premiums and accretion of discounts on investments	103
Changes in operating assets and liabilities
Prepaid expenses and other current assets	(196)	(531)
Other assets	(318)	(9,038)
Accounts payable	5,116	5,802
Payable and accrued liabilities due to related party	894	716
Accrued expenses and other current liabilities	2,761	1,210
Other non-current liabilities	(572)	2,291
Net cash used in operating activities	(37,672)	(25,757)
Investing activities
Purchase of investments	(279,207)
Sales and maturities of investments	20,000
Purchase of property and equipment	(846)	(7)
Net cash used in investing activities	(260,053)	(7)
Financing activities
Proceeds from exercise of stock options under equity incentive plan	340	1,479
Proceeds from issuance of common stock under employee stock purchase plan	302	103
Principal payments on finance leases	(140)	(73)
Net cash provided by financing activities	502	1,509
Net decrease in cash, cash equivalents and restricted cash	(297,223)	(24,255)
Cash, cash equivalents and restricted cash at beginning of year	363,667	434,219
Cash, cash equivalents and restricted cash at end of period	66,444	409,964
Supplemental disclosure of non-cash investing and financing activities
Purchase of property and equipment in accounts payable and accrued expenses	266	127
Right-of-use asset acquired under operating leases	4,684	1,812
Right-of-use asset acquired under finance leases		834
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents	66,378	409,964
Restricted cash (included in other assets)	66
Total cash and cash equivalents and restricted cash	$ 66,444	$ 409,964