Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 37,622	$ 32,499
Short-term investments	209,978	283,725
Accounts receivable, net		4,831
Other receivables	1,450	1,326
Inventory	6,935	4,491
Prepaid expenses and other current assets	3,117	3,082
Total current assets	264,102	330,513
Long-term investments	64,894	56,858
Operating lease right-of-use assets	23,345	25,177
Property and equipment, net	20,677	22,193
Restricted cash	524	524
Other assets	9,882	1,004
Total assets	383,424	436,269
Current liabilities:
Accounts payable	736	1,370
Accrued expenses	10,899	9,212
Deferred revenue	354	206
Operating lease liabilities, current	2,249	2,295
Other current liabilities	145	139
Total current liabilities	14,383	13,222
Operating lease liabilities, net of current portion	24,250	25,964
Other noncurrent liabilities	64	179
Total liabilities	38,697	39,365
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.00001 par value; 5,000,000 shares authorized as of September 30, 2024 and December 31, 2023; zero shares issued and outstanding as of September 30, 2024 and December 31, 2023	0	0
Additional paid-in capital	714,567	702,868
Accumulated other comprehensive gain (loss)	789	(192)
Accumulated deficit	(370,630)	(305,773)
Total stockholders’ equity	344,727	396,904
Total liabilities and stockholders’ equity	383,424	436,269
Class A common stock
Stockholders’ equity:
Common stock	1	1
Class B common stock
Stockholders’ equity:
Common stock	0	0
Nonrelated Party
Current assets:
Accounts receivable, net	4,446
Related Party
Current assets:
Accounts receivable, net	$ 554	$ 559