Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 31,010	$ 38,129
Investments in marketable securities	149,906	213,171
Prepaid expenses and other current assets	4,777	4,058
Total current assets	185,693	255,358
Property and equipment, net	53,013	43,020
Operating lease right-of-use assets	13,114	11,685
Restricted cash, noncurrent	399	547
Other noncurrent assets	3,710	3,579
Total assets	255,929	314,189
Current liabilities:
Accounts payable	5,347	10,721
Accrued and other current liabilities	9,498	9,059
Operating lease liabilities, current	3,896	1,994
Total current liabilities	18,741	21,774
Operating lease liabilities, noncurrent	13,104	13,707
Other noncurrent liabilities	217	182
Total liabilities	32,062	35,663
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock	4	4
Additional paid-in capital	439,588	434,196
Accumulated other comprehensive loss	(739)	(141)
Accumulated deficit	(214,986)	(155,533)
Total stockholders' equity	223,867	278,526
Total liabilities and stockholders' equity	$ 255,929	$ 314,189