Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Federal and state provision for income tax expense	$ 0	$ 0
Income tax (provision) benefit from foreign jurisdictions	$ 76,000,000	(53,000,000)	$ (547,000)
U.S. federal statutory rate	21.00%
Valuation allowance increase (decrease)	$ 1,600,000	16,800,000	20,400,000
Change in valuation allowance, amount	6,316,000	16,563,000	20,418,000
Deferred tax liability on undistributed earnings of non-U.S. subsidiaries	0
Unremitted earnings reinvested in foreign subsidiaries	1,100,000	1,100,000	600,000
Unrecognized tax benefits	9,224,000	8,597,000	8,188,000	$ 7,371,000
Income taxes paid	$ 0		$ 405,000
Cash refunded		$ (72,000)
Income tax examination, year under examination	2022
Income tax examination adjustment	$ 0
Minimum [Member]
Income Taxes [Line Items]
Open tax year	2010
Maximum [Member]
Income Taxes [Line Items]
Open tax year	2025
Domestic Tax Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carryforwards	$ 609,900,000
Tax credit carryforward	$ 10,200,000
Tax credit carryforward, expiration date	Dec. 31, 2030
Domestic Tax Jurisdiction [Member] | Indefinite [Member]
Income Taxes [Line Items]
Operating loss carryforwards	$ 422,900,000
State Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carryforwards	467,000,000
Tax credit carryforward	$ 7,400,000