Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 248,009	$ 32,570
Short-term investments	165,052	59,614
Prepaid expenses and other current assets	6,741	1,119
Total current assets	419,802	93,303
Long-term investments	49,001	4,762
Total property and equipment, net	13,646	3,721
Operating lease right-of-use assets	27,322	473
Restricted cash	2,027	0
Other noncurrent assets	166	427
Total assets	511,964	102,686
Current liabilities:
Accounts payable	4,550	1,506
Accrued expenses	4,974	818
Current portion of operating lease liabilities	937	285
Current portion of other liabilities	2,395	88
Total current liabilities	12,856	2,697
Noncurrent operating lease liabilities	31,120	211
Other noncurrent liabilities	2,469	74
Total liabilities	46,445	2,982
Commitments and contingencies (Note 13)
Convertible preferred stock, $0.001 par value; zero and 21,506,977 shares authorized as of December 31, 2020 and 2019, respectively; zero and 21,504,893 share issued and outstanding as of December 31, 2020 and 2019, respectively; zero and $123,016 liquidation preference as of December 31, 2020 and 2019, respectively.	0	122,907
Stockholder's equity:
Common stock, $0.001 par value, 200,000,000 and 40,000,000 shares authorized as of December 31, 2020 and 2019 respectively; 54,073,901 and 5,660,391 shares issued and outstanding as of December 31, 2020 and 2019, respectively.	54	6
Additional paid-in capital	577,390	271
Accumulated deficit	(111,906)	(23,462)
Accumulated other comprehensive loss	(19)	(18)
Total stockholders' equity (deficit)	465,519	(23,203)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	$ 511,964	$ 102,686