CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets
Cash and cash equivalents	$ 15,591	$ 9,227
Accounts receivable	1,192	1,923
Prepaid expenses and other current assets	4,784	6,401
Short-term investments	92,964	110,918
Assets held for sale	0	2,563
Total current assets	114,531	131,032
Property and equipment, net	32,563	25,920
Operating lease right-of-use assets	4,439	5,431
Other assets	932	1,079
Long-term investments	76,745	99,584
Total assets	229,210	263,046
Current liabilities
Accounts payable	2,689	5,243
Current portion of operating lease liabilities	2,570	2,426
Accrued expenses and other current liabilities	5,000	6,622
Total current liabilities	10,259	14,291
Operating lease liabilities, net of current portion	3,040	4,366
Other liabilities	41	0
Total liabilities	13,340	18,657
Commitments and contingencies (Note 10)
Stockholders’ equity
Common stock, $0.0001 par value; 250,000,000 shares authorized; 186,046,206 and 184,428,472 shares issued at June 30, 2025 and December 31, 2024, respectively; $175,436,136 and $173,818,402 shares outstanding as of June 30, 2025 and December 31, 2024, respectively	19	18
Additional paid-in capital	410,463	408,315
Treasury stock, at cost; $10,610,070 and $10,610,070 shares as of June 30, 2025 and December 31, 2024, respectively	(14,132)	(14,132)
Accumulated deficit	(180,480)	(149,812)
Total stockholders’ equity	215,870	244,389
Total liabilities and stockholders’ equity	$ 229,210	$ 263,046