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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Inventory valuation $ 10,949 $ 11,170
Net operating losses 51,260 63,342
Credit carry forwards 54,160 55,103
Warranty and installation accruals 1,045 1,391
Share-based compensation 4,587 6,296
Customer deposits and deferred revenue 10,982 5,986
Operating leases 2,281 3,181
Other 4,741 3,501
Total deferred tax assets 140,005 149,970
Valuation allowance (118,443) (130,053)
Net deferred tax assets 21,562 19,917
Deferred tax liabilities:    
Purchased intangible assets 7,227 9,345
Convertible Senior Notes 13,674 8,831
Operating leases 2,241 3,172
Depreciation 2,220 2,668
Total deferred tax liabilities 25,362 24,016
Net deferred taxes (3,800) $ (4,099)
Undistributed earnings of foreign subsidiaries    
Undistributed earnings of foreign subsidiaries $ 700