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Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued employee benefit plan costs $ 8,815 $ 7,422
Stock based compensation 407 972
Net operating loss and tax credit carryforwards 148,699 99,281
Restructuring fees not currently deductible for tax purposes 1,415 2,264
Disallowed business interest expense carryforward 5,546 5,105
Other 2,518 3,380
Gross deferred tax assets 167,400 118,424
Less valuation allowance (140,428) (103,496)
Net deferred tax assets 26,972 14,928
Depreciation and amortization (25,883) (11,246)
Outside basis difference deferred tax liability (2,891) (2,892)
Foreign interest withholding tax (859) 0
Other (754) (2,981)
Gross deferred tax liabilities (30,387) (17,119)
Net deferred tax assets (liabilities) $ (3,415) $ (2,191)