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Income Taxes (Tax Rates) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statutory federal tax rate	(34.00%)	(34.00%)	(34.00%)
State income taxes, net of federal benefit	(3.00%)	(3.00%)	(3.00%)
Research and development and other tax credits	(3.00%)	(2.00%)	(7.00%)
Expiration of net operating losses	0.00%	0.00%	0.00%
Release of FIN 48 liability	(2.00%)	0.00%	0.00%
Other	1.00%	2.00%	3.00%
Change in valuation allowance	41.00%	37.00%	41.00%
Effective tax rate	0.00%	0.00%	0.00%

X

- Definition

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 release of FIN 48 liability.

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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 attributable to other adjustments.

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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 research tax credit.

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