Income Taxes (Details 3)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of difference between the federal statutory tax rate and the effective tax rate
Federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	2.50%	2.40%	3.10%
Foreign income tax	(10.30%)	(7.90%)	(0.90%)
Research and development tax credits	1.10%	1.00%	(0.30%)
Non-Deductible components of convertible debt	(3.80%)	(16.70%)	0.00%
Valuation allowance	(25.30%)	(11.40%)	(11.40%)
Other	0.80%	(3.90%)	(0.70%)
Total	0.00%	(1.50%)	24.80%

Effective Income Tax Rate Reconciliation, Nondeductible Expense, Convertible Debt

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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