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Income Taxes - Deferred Income Tax Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Stock and long-term compensation plans $ 1,337 $ 2,450
Foreign NOL & other carryforwards 38,153 29,267
US state NOL carryforwards 5,539 718
Deferred revenue 2,068 671
Pension liability 1,547 2,074
Amortization and depreciation 257 167
Lease liability 3,171 3,837
Accrued expenses and other 1,157 1,264
Total gross deferred tax assets 53,229 40,448
Less: Valuation allowance (34,979) (19,992)
Net deferred tax assets (liabilities) 18,250 20,456
Deferred tax liabilities:    
Accruals 231 286
Tax on unremitted foreign earnings 1,357 1,809
Right of use asset 2,872 3,251
Intangible assets 5,225 6,135
Tax on credits 3,439 2,241
Contract acquisition costs 2,626 1,616
Deferred tax liabilities 15,750 15,338
Net deferred tax assets (liabilities) $ 2,500 $ 5,118