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	$ (88,502)	$ (68,511)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	552	51
Non-cash lease expense	720	210
Amortization and accretion of discounts on short-term investments	49	897
Stock compensation expense	21,418	17,829
Changes in operating assets and liabilities:
Interest receivable	(41)	41
Prepaid expenses and other current assets	1,423	1,638
Other assets	245	(692)
Income tax payable	(853)
Accounts payable, accrued expenses and amount due to related party	(10,365)	6,723
Net cash used in operating activities	(75,354)	(41,814)
Cash flows from investing activities
Purchase of property and equipment		(363)
Purchase of short-term investments	(92,783)	(30,098)
Maturities of short-term investments	37,325	175,000
Net cash (used in) provided by investing activities	(55,458)	144,539
Cash flows from financing activities
Proceeds from issuance of stock under the 2020 Employee Stock Purchase Plan	244
Net cash provided by financing activities	244
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		61
Net (decrease) increase in cash, cash equivalents, and restricted cash	(130,568)	102,786
Cash, cash equivalents, and restricted cash at beginning of period	202,513	122,661
Cash, cash equivalents, and restricted cash at end of period	71,945	225,447
Non-cash investing and financing activities
Unrealized (loss) gain on available-for-sale securities	(289)	26
Right-of-use assets obtained in exchange for operating lease liability		3,089
Reduction of right-of-use asset due to modification	(5,506)
Purchase of property and equipment included in accounts payable and accrued expenses		91
Supplemental disclosure of cash flows
Cash paid for income taxes	1,003
Cash and cash equivalents	71,093	225,447
Restricted cash	852
Total cash, cash equivalents, and restricted cash	$ 71,945	$ 225,447