Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 445,763	$ 333,585
Investments	85,379	98,278
Inventory	1,541	551
Other receivables	412	163
Other receivables, related parties	101	99
Prepaid expenses and other current assets	3,041	452
Total current assets	536,237	433,128
Property and equipment, net	8,682	8,441
Restricted cash	343	343
Other assets	377	407
Total assets	545,639	442,319
Current liabilities:
Accounts payable	1,933	2,115
Accrued expenses	4,201	5,147
Accrued research and development	820	396
Deferred revenue	256	250
Deferred rent, current	186	186
Total current liabilities	7,396	8,094
Deferred rent, net of current portion	1,884	1,899
Other noncurrent liabilities	589	717
Total liabilities	9,869	10,710
Commitments
Stockholders’ equity:
Preferred stock, $0.00001 par value; 5,000,000 shares authorized as of March 31, 2021 and December 31, 2020; zero shares issued and outstanding as of March 31, 2021 and December 31, 2020	0	0
Additional paid-in capital	607,531	486,915
Accumulated other comprehensive income	28	54
Accumulated deficit	(71,790)	(55,361)
Total stockholders’ equity	535,770	431,609
Total liabilities and stockholders’ equity	545,639	442,319
Class A common stock
Stockholders’ equity:
Common stock	1	1
Class B common stock
Stockholders’ equity:
Common stock	$ 0	$ 0