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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Inventory valuation $ 11,822 $ 10,949
Net operating losses 38,816 51,260
Credit carry forwards 57,810 54,160
Warranty and installation accruals 1,730 1,045
Share-based compensation 4,033 4,587
Customer deposits and deferred revenue 9,908 10,982
Operating leases 8,464 2,281
Other 5,880 4,741
Total deferred tax assets 138,463 140,005
Valuation allowance (116,054) (118,443)
Net deferred tax assets 22,409 21,562
Deferred tax liabilities:    
Purchased intangible assets 6,633 7,227
Convertible Senior Notes 10,018 13,674
Operating leases 6,539 2,241
Depreciation 2,372 2,220
Total deferred tax liabilities 25,562 25,362
Net deferred taxes (3,153) $ (3,800)
Undistributed earnings of foreign subsidiaries    
Undistributed earnings of foreign subsidiaries $ 800