Condensed Consolidated Balance Sheets - Unaudited - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 84,389	$ 60,649
Marketable securities	244,609	302,301
Interest receivable	1,903	1,375
Prepaid assets	3,106	3,399
Prepaid clinical	6,151	6,413
Other current assets	0	9
Total current assets	340,158	374,146
Fixed assets, net	41,937	42,143
Right of use assets, net	5,668	4,263
Total assets	387,763	420,552
Current liabilities
Accounts payable	3,376	5,098
Lease liabilities	1,092	803
Accrued expenses and other	13,263	17,665
Income taxes payable	1,570	1,472
Total current liabilities	19,301	25,038
Income tax payable, net of current portion	568	568
Lease liabilities, net of current portion	4,859	3,610
Total liabilities	24,728	29,216
Commitments and contingencies
Redeemable noncontrolling interest	1,459,097	1,494,732
Shareholders' deficit
Additional paid-in capital	53,114	36,114
Accumulated other comprehensive (loss) gain	(44)	130
Accumulated deficit	(1,149,155)	(1,139,663)
Total shareholders' deficit	(1,096,062)	(1,103,396)
Total liabilities and shareholders' deficit	387,763	420,552
Common Class A [Member]
Shareholders' deficit
Common stock value	6	6
Common Class B [Member]
Shareholders' deficit
Common stock value	$ 17	$ 17