CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 14,715	$ 12,881
Accounts receivable	122	40
Prepaid expenses and other current assets	6,559	18,483
Short-term investments	126,703	150,297
Assets held for sale	5,973	0
Total current assets	154,072	181,701
Property and equipment, net	12,701	9,987
Operating lease right-of-use assets	6,992	7,070
Other assets	1,360	1,439
Long-term investments	122,529	128,186
Total assets	297,654	328,383
Current liabilities
Accounts payable	2,119	4,224
Current portion of operating lease liabilities	1,436	847
Accrued expenses and other current liabilities	6,948	10,051
Total current liabilities	10,503	15,122
Operating lease liabilities, net of current portion	6,207	6,792
Other liabilities	534	203
Total liabilities	17,244	22,117
Commitments and contingencies (Note 9)
Stockholders’ equity
Common stock, $0.0001 par value; 250,000,000 shares authorized; 184,016,695 and 183,071,317 shares issued at March 31, 2024 and December 31, 2023, respectively; 175,304,238 and 183,034,255 shares outstanding as of March 31, 2024 and December 31, 2023, respectively	18	18
Additional paid-in capital	405,118	404,045
Treasury stock, at cost; 8,712,457 and 37,062 shares as of March 31, 2024 and December 31, 2023, respectively	(11,370)	(33)
Accumulated deficit	(113,356)	(97,764)
Total stockholders’ equity	280,410	306,266
Total liabilities and stockholders’ equity	$ 297,654	$ 328,383