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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Inventory valuation $ 11,170 $ 8,943
Net operating losses 63,342 67,787
Credit carry forwards 55,103 52,592
Warranty and installation accruals 1,391 1,695
Share-based compensation 6,296 6,981
Other 9,496 2,182
Total deferred tax assets 146,798 140,180
Valuation allowance (130,053) (114,955)
Net deferred tax assets 16,745 25,225
Deferred tax liabilities:    
Purchased intangible assets 9,345 15,401
Convertible Senior Notes 8,831 11,265
Depreciation 2,668 2,380
Total deferred tax liabilities 20,844 29,046
Net deferred taxes (4,099) $ (3,821)
Undistributed earnings of foreign subsidiaries    
Undistributed earnings of foreign subsidiaries $ 600