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Income Taxes (Reconciliation Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Deferred tax assets:      
Net operating loss carryforwards $ 194,440   $ 264,183
Research and development credits 39,145   32,043
Depreciation     1,170
Accruals and reserves 14,480   20,088
Deferred rent 3,360    
Total deferred tax assets 251,425 $ 321,500 317,484
Less: Valuation allowance (249,202)   (317,412)
Deferred tax liabilities:      
Depreciation (2,223)    
Deferred rent     (72)
Net deferred tax assets