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Income Taxes - Net Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Accrued expenses $ 1,016 $ 1,940
Provision for excess and obsolete inventory 466 2,016
Convertible debt 9,804 13,367
Interest expense limitation 11,113 7,798
Net operating loss and tax credit carryforwards 110,463 108,340
Share-based compensation 2,562 1,911
Right-of-use-asset 1,765 2,059
Unrecognized tax benefits 1,567 1,567
Deferred tax assets 138,756 138,998
Deferred tax liabilities:    
Operating lease liability (1,830) (2,059)
Acquired intangible assets (666) (2,155)
Depreciation and amortization (4,376) (5,545)
Unrealized foreign currency gains (604) (375)
Deferred tax liabilities (7,476) (10,134)
Valuation allowance (132,132) (133,369)
Net deferred tax liabilities $ (852) $ (4,505)