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Income Taxes (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 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

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