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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

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