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Employee Benefit Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Benefit Plan [Abstract]
Discretionary or matching contributions	$ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

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- Details

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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