CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Current assets
Cash and cash equivalents	$ 17,878	$ 9,227
Accounts receivable	726	1,923
Prepaid expenses and other current assets	4,238	6,401
Short-term investments	87,121	110,918
Assets held for sale	0	2,563
Total current assets	109,963	131,032
Property and equipment, net	41,604	25,920
Operating lease right-of-use assets	3,959	5,431
Other assets	964	1,079
Long-term investments	59,743	99,584
Total assets	216,233	263,046
Current liabilities
Accounts payable	2,052	5,243
Current portion of operating lease liabilities	2,644	2,426
Accrued expenses and other current liabilities	5,287	6,622
Total current liabilities	9,983	14,291
Operating lease liabilities, net of current portion	2,353	4,366
Other liabilities	41	0
Total liabilities	12,377	18,657
Commitments and contingencies (Note 10)
Stockholders’ equity
Common stock, $0.0001 par value; 250,000,000 shares authorized; 186,582,398 and 184,428,472 shares issued at September 30, 2025 and December 31, 2024, respectively; $175,972,328 and $173,818,402 shares outstanding as of September 30, 2025 and December 31, 2024, respectively	19	18
Additional paid-in capital	411,786	408,315
Treasury stock, at cost; $10,610,070 and $10,610,070 shares as of September 30, 2025 and December 31, 2024, respectively	(14,132)	(14,132)
Accumulated deficit	(193,817)	(149,812)
Total stockholders’ equity	203,856	244,389
Total liabilities and stockholders’ equity	$ 216,233	$ 263,046