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Income Taxes (Deferred Tax Assets (Liabilities)) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Net operating losses U.S. | $ 286,619 | $ 203,284
Net operating losses foreign | 9,011 | 8,360
Research tax credits | 23,260 | 16,491
Deferred revenue | 10,121 | 922
Original discount interest | 12,445 | 0
Other | 17,981 | 11,981
Total deferred tax assets | 359,437 | 241,038
Intangibles | (2,090) | (2,415)
Other | (2,817) | (1,767)
Total deferred tax liabilities | (4,907) | (4,182)
Net deferred tax assets | 354,530 | 236,856
Less valuation allowance | (354,530) | (236,856)
Deferred tax assets, net | $ 0 | $ 0

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