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Fair Value Measurements - Schedule of Fair Value of Financial Assets (Details) - Fair Value, Measurements, Recurring - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financial Assets
Realized gains or losses on financial assets	$ 0	$ 0	$ 0	$ 0
Money Market Funds
Financial Assets
Assets at fair value	41,070,000		41,070,000		$ 51,047,000
Money Market Funds | Level I
Financial Assets
Assets at fair value	$ 41,070,000		$ 41,070,000		$ 51,047,000

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (a)



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- References

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- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 9



-Subparagraph (a)



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