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Income Taxes - Significant Components 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:        
Net operating loss carryforwards $ 91,034 $ 64,648    
Tax credit carryforwards 7,110 5,601    
Share-based compensation 8,831 5,932    
Allowances and other 14,996 11,443    
Lease obligation 22,624 23,869    
Total deferred tax assets 144,595 111,493    
Valuation allowance (123,803) (88,433) $ (66,435) $ (44,321)
Net deferred tax assets 20,792 23,060    
Deferred Tax Liabilities:        
Depreciation and Amortization 108 850    
Right of use asset 20,634 22,171    
Total deferred tax liability 20,742 23,021    
Total deferred tax assets $ 50 $ 39