Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 36,396	$ 53,208
Short-term investments	294,852	368,031
Other receivables	752	899
Inventory	4,225	4,627
Prepaid expenses and other current assets	2,903	2,098
Total current assets	346,122	434,982
Long-term investments	49,573	5,157
Operating lease right-of-use assets	25,774	27,003
Property and equipment, net	21,730	19,408
Restricted cash	524	524
Other assets	1,130	855
Total assets	444,853	487,929
Current liabilities:
Accounts payable	753	2,104
Accrued expenses	9,147	8,298
Deferred revenue	185	133
Operating lease liabilities, current	2,310	1,842
Other current liabilities	123	207
Total current liabilities	12,518	12,584
Operating lease liabilities, net of current portion	26,499	28,032
Other noncurrent liabilities	157	320
Total liabilities	39,174	40,936
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.00001 par value; 5,000,000 shares authorized as of September 30, 2023 and December 31, 2022; zero shares issued and outstanding as of September 30, 2023 and December 31, 2022	0	0
Additional paid-in capital	694,948	667,739
Accumulated other comprehensive loss	(1,296)	(1,251)
Accumulated deficit	(287,974)	(219,496)
Total stockholders’ equity	405,679	446,993
Total liabilities and stockholders’ equity	444,853	487,929
Nonrelated party
Current assets:
Accounts receivable, net	5,492	4,315
Related party
Current assets:
Accounts receivable, net	1,502	1,804
Class A common stock
Stockholders’ equity:
Common stock	1	1
Class B common stock
Stockholders’ equity:
Common stock	$ 0	$ 0