Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Taxes [Abstract]
Net operating losses or credits utilization period			1 year
Change in cumulative ownership percentage (in hundredths)			50.00%
Period with in which cumulative ownership change			3 years
Gross unrecognized tax benefits	$ 16,400,000		$ 16,400,000
Unrecognized tax benefits interest and penalties	0
Unrecognized tax benefits accrued interest and penalties	0		0
Federal income tax benefit or expense	$ 0	$ 0	$ 0	$ 0