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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Capitalized research expense $ 8,546 $ 567
Net operating loss carryforwards 71,665 95,500
Research and development and other tax credits 7,531 5,300
Deferred revenue 297 5,452
Deferred rent 2,097 2,231
Stock-based compensation 3,091 4,511
Acquired intangibles 858 989
Other 1,906 3,783
Deferred tax assets, gross 95,991 118,333
Valuation allowance (94,039) (113,407)
Total deferred tax assets 1,952 4,926
Deferred tax liabilities:    
Acquired intangibles (124) (175)
Investment in affiliated entity (422) (3,624)
Fixed assets (1,430) (1,302)
Net deferred tax liabilities $ (24) $ (175)