Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 225,334	$ 232,813
Short-term investments	219,892	167,261
Accounts receivable, net	2,793	2,495
Related party receivables	1,126	1,283
Other receivables	540	366
Inventory	3,550	4,145
Prepaid expenses and other current assets	4,221	3,336
Total current assets	457,456	411,699
Long-term investments	26,550	93,186
Operating lease right-of-use assets	28,411	20,142
Property and equipment, net	13,654	13,087
Restricted cash	524	524
Other assets	490	501
Total assets	527,085	539,139
Current liabilities:
Accounts payable	3,291	3,789
Accrued expenses	6,377	8,394
Deferred revenue	394	376
Operating lease liabilities, current	1,090	864
Total current liabilities	11,152	13,423
Operating lease liabilities, net of current portion	29,134	22,459
Other noncurrent liabilities	341	341
Total liabilities	40,627	36,223
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.00001 par value; 5,000,000 shares authorized as of March 31, 2022 and December 31, 2021; zero shares issued and outstanding as of March 31, 2022 and December 31, 2021	0	0
Additional paid-in capital	638,860	629,981
Accumulated other comprehensive loss	(2,227)	(536)
Accumulated deficit	(150,176)	(126,530)
Total stockholders’ equity	486,458	502,916
Total liabilities and stockholders’ equity	527,085	539,139
Class A common stock
Stockholders’ equity:
Common stock	1	1
Class B common stock
Stockholders’ equity:
Common stock	$ 0	$ 0