Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 331,402	$ 333,585
Investments	175,202	98,278
Accounts receivable, net	1,165	0
Related party receivables	703	99
Other receivables	672	163
Inventory	2,557	551
Prepaid expenses and other current assets	2,566	452
Total current assets	514,267	433,128
Property and equipment, net	12,588	8,441
Restricted cash	524	343
Other assets	459	407
Total assets	527,838	442,319
Current liabilities:
Accounts payable	2,573	2,115
Accrued expenses	5,974	5,147
Accrued research and development	627	396
Deferred revenue	111	250
Deferred rent, current	268	186
Total current liabilities	9,553	8,094
Deferred rent, net of current portion	2,687	1,899
Other noncurrent liabilities	402	717
Total liabilities	12,642	10,710
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.00001 par value; 5,000,000 shares authorized as of September 30, 2021 and December 31, 2020; zero shares issued and outstanding as of September 30, 2021 and December 31, 2020	0	0
Additional paid-in capital	621,994	486,915
Accumulated other comprehensive income (loss)	(8)	54
Accumulated deficit	(106,791)	(55,361)
Total stockholders’ equity	515,196	431,609
Total liabilities and stockholders’ equity	527,838	442,319
Class A common stock
Stockholders’ equity:
Common stock	1	1
Class B common stock
Stockholders’ equity:
Common stock	$ 0	$ 0