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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)

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