CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 188,568	$ 20,607
Short-term investments, available-for-sale	141,191	16,384
Prepaid expenses and other current assets	3,635	474
Total current assets	333,394	37,465
Restricted cash	413	268
Property and equipment, net	9,180	3,080
Operating lease right-of-use assets	8,763	7,144
Other long-term assets	545	455
Total assets	352,295	48,412
Current liabilities
Accounts payable	2,262	1,882
Operating lease liabilities, current portion	1,476	1,516
Preferred stock purchase right liability		1,478
Accrued and other current liabilities	5,821	3,289
Total current liabilities	9,559	8,165
Operating lease liabilities, net of current portion	7,659	5,780
Other long-term liabilities	96	134
Total liabilities	17,314	14,079
Commitments
Convertible preferred stock		59,815
Stockholders’ equity (deficit)
Common stock	3	1
Additional paid-in capital	435,098	1,179
Accumulated other comprehensive loss	4	(2)
Accumulated deficit	(100,124)	(26,660)
Total stockholders’ equity (deficit)	334,981	(25,482)
Total liabilities and stockholders’ equity (deficit)	$ 352,295	$ 48,412