Income Taxes (Schedule of Reconciliation of U.S. Federal Statutory Rate to Effective Tax Rate) (Details)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of the U.S. federal statutory rate to the Company?s effective tax rate:
Tax at statutory rates	(34.00%)	(34.00%)	(34.00%)
State income taxes	(2.00%)	(3.30%)	(3.40%)
Change in tax rate	(1.60%)	5.00%	0.40%
Permanent differences	16.20%	(11.70%)	9.60%
Foreign rate differential	(0.40%)	(0.40%)	0.30%
Research and development credits	(7.90%)	(9.50%)
Change in valuation allowance	31.20%	56.00%	5.20%
Other, net	0.10%
Effective tax rate	1.60%	2.10%	(21.90%)

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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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 state and local income tax expense (benefit), net of federal tax expense (benefit).

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