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Income Taxes - Schedule of Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:        
NOL carryforwards $ 227,872 $ 198,633    
Tax credits 57,385 52,395    
Share-based compensation 45,214 44,873    
Accrued expenses and reserves 20,337 15,892    
Other 8,756 8,669    
Less: valuation allowance (242,059) (219,093) $ (172,797) $ (141,859)
Total deferred tax assets 117,505 101,369    
Deferred tax liabilities:        
Property, plant and equipment (19,926) (14,533)    
Other (1,590) (1,274)    
Total deferred tax liabilities (21,516) (15,807)    
Net deferred tax assets $ 95,989 $ 85,562