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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets        
Allowance for doubtful accounts $ 1,816 $ 2,140    
Inventory 289 415    
Equity securities and investments in affiliates 570 11,933    
Property, plant and equipment 1,882 1,830    
Intangible assets 74,981 85,308    
Accrued liabilities 1,834 3,385    
Lease liabilities 6,140 10,035    
Stock-based compensation 16,402 19,389    
Deferred revenue 7,423 14,876    
Research and development tax credits 10,210 9,686    
Investments in subsidiaries included in discontinued operations 0 8,592    
Net operating, capital loss, and interest expense carryforwards 275,519 196,663    
Total deferred tax assets 397,066 364,252    
Less: Valuation allowance 387,348 349,008 $ 292,217 $ 211,078
Net deferred tax assets 9,718 15,244    
Deferred tax liabilities        
Right-of-use assets 5,011 8,091    
Long-term debt 7,604 9,987    
Total deferred tax liabilities 12,615 18,078    
Net deferred tax liabilities included in continuing operations $ (2,897) $ (2,834)