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Income Taxes (Deferred Tax Assets (Liabilities)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Net operating losses U.S. $ 203,284 $ 148,451
Net operating losses foreign 8,360 6,535
Research tax credits 16,491 11,068
Other 12,903 9,963
Total deferred tax assets 241,038 176,017
Intangibles (2,415) (2,773)
Other (1,767) (321)
Total deferred tax liabilities (4,182) (3,094)
Net deferred tax assets 236,856 172,923
Less valuation allowance (236,856) (172,923)
Deferred tax assets, net $ 0 $ 0