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401(k) Retirement Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
401(k) Retirement Plan [Abstract]
Retirement plan, employer contribution amount	$ 279,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 244,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 253,000us-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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