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Income Taxes (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Capitalized research expense $ 567 $ 1,201
Net operating loss carryforwards 95,500 71,848
Research and development and other tax credits 5,300 3,339
Deferred revenue 5,452 5,213
Deferred rent 2,231 2,171
Stock-based compensation 4,511 2,135
Acquired intangibles 269 0
Other 4,328 3,457
Deferred Tax Assets, Gross 118,158 89,364
Valuation allowance (113,407) (83,245)
Total deferred tax assets 4,751 6,119
Deferred tax liabilities:    
Acquired intangibles 0 (596)
Investment in affiliated entity (3,624) (4,399)
Fixed assets (1,302) (1,299)
Net deferred tax liabilities $ (175) $ (175)