Discontinued Operations- Schedule of Cash Flows from Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Cash flows from operating activities from discontinued operations
Net income from discontinued operations	$ 0	$ 0	$ 0	$ 96,250
SI Business | Discontinued Operations
Cash flows from operating activities from discontinued operations
Net income from discontinued operations	0	0	0	96,250
Change in operating assets and liabilities:
Accounts payable			0	(1,783)
Accrued expenses and other			0	(519)
Subscription refund liability			0	(423)
Subscription liability			0	(44,684)
Royalty fee liability			0	(3,750)
Termination fee liability			0	(45,000)
Cash Provided by (Used in) Operating Activity, Discontinued Operation			0	91
General and administrative	$ 0	$ 0	$ 0	(48,971)
SI Business | Discontinued Operations | Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:DisposalGroupIncludingDiscontinuedOperationAccountsPayable
Change in operating assets and liabilities:
General and administrative				221
SI Business | Discontinued Operations | Location, Statement of Financial Position, Activity, Accrual [Axis]: aren:DisposalGroupIncludingDiscontinuedOperationRoyaltyFeeLiability
Change in operating assets and liabilities:
General and administrative				3,750
SI Business | Discontinued Operations | Location, Statement of Financial Position, Activity, Accrual [Axis]: aren:DisposalGroupIncludingDiscontinuedOperationTerminationFeeLiability
Change in operating assets and liabilities:
General and administrative				$ 45,000