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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

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- 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) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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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) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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