CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities
Net loss	$ (130,574)	$ (114,021)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	637	95
Non-cash lease expense	834	468
Accretion (amortization) of short-term investment premiums (discounts)	(206)	1,130
Stock compensation expense	32,273	28,115
Changes in operating assets and liabilities:
Interest receivable	(211)	299
Prepaid expenses and other current assets and prepaid expenses to related party	(1,862)	(1,943)
Other assets	367	(1,206)
Income tax payable	(853)
Accounts payable, accrued expenses and amount due to related party	(10,886)	8,812
Net cash used in operating activities	(110,481)	(78,251)
Cash flows from investing activities
Purchase of property and equipment		(396)
Purchase of short-term investments	(191,340)	(30,098)
Maturities of short-term investments	97,325	230,000
Net cash (used in) provided by investing activities	(94,015)	199,506
Cash flows from financing activities
Proceeds from issuance of common stock in registered direct offering, net of issuance costs	126,425
Proceeds from issuance of stock under the 2020 Employee Stock Purchase Plan	244
Proceeds from exercise of stock options		167
Net cash provided by financing activities	126,669	167
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		(44)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(77,827)	121,378
Cash, cash equivalents, and restricted cash at beginning of period	202,513	122,661
Cash, cash equivalents, and restricted cash at end of period	124,686	244,039
Non-cash investing and financing activities
Unrealized (loss) gain on available-for-sale securities	(408)	23
Right-of-use assets obtained in exchange for operating lease liability		26,386
Reduction of right-of-use asset due to modification	(5,506)
Purchase of property and equipment included in accounts payable and accrued expenses	32
Supplemental disclosure of cash flows
Cash paid for income taxes	1,003
Cash and cash equivalents	123,834	243,187
Restricted cash	852	852
Total cash, cash equivalents, and restricted cash	$ 124,686	$ 244,039