Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 66,143,000	$ 67,739,000
Short-term marketable securities	234,518,000	230,570,000
Prepaid expenses and other current assets	9,999,000	10,484,000
Total current assets	310,660,000	308,793,000
Long-term marketable securities	86,088,000	142,164,000
Property and equipment, net	14,825,000	16,321,000
Operating lease assets	30,814,000	32,218,000
Restricted cash	408,000	408,000
Other assets	2,591,000	2,622,000
Total assets	445,386,000	502,526,000
Current liabilities:
Accounts payable	1,663,000	468,000
Accrued expenses and other current liabilities	21,779,000	26,308,000
Operating lease liabilities	4,709,000	4,619,000
Total current liabilities	28,151,000	31,395,000
Operating lease liabilities, net of current portion	44,714,000	47,270,000
Other liabilities	263,000	362,000
Total liabilities	73,128,000	79,027,000
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.0001 par value; 80,000,000 shares authorized at June 30, 2025 and December 31, 2024; no shares issued and outstanding at June 30, 2025 and December 31, 2024
Common stock, $0.0001 par value; 800,000,000 shares authorized at June 30, 2025 and December 31, 2024; 283,650,139 and 283,218,344 shares issued and outstanding at June 30, 2025 and December 31, 2024, respectively	28,000	28,000
Additional paid-in capital	1,204,320,000	1,190,729,000
Accumulated other comprehensive income	415,000	405,000
Accumulated deficit	(832,505,000)	(767,663,000)
Total stockholders' equity	372,258,000	423,499,000
Total liabilities and stockholders' equity	$ 445,386,000	$ 502,526,000