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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |
Assets fair value | $ 168,662 | $ 161,280
Level 1 |  |
Assets: |  |
Assets fair value | 22,253 | 35,730
Level 2 |  |
Assets: |  |
Assets fair value | 146,409 | 125,550
Cash equivalents | Money Market Funds |  |
Assets: |  |
Assets fair value | 22,253 | 35,730
Cash equivalents | Commercial Paper |  |
Assets: |  |
Assets fair value | 20,492 | 17,245
Cash equivalents | Level 1 | Money Market Funds |  |
Assets: |  |
Assets fair value | 22,253 | 35,730
Cash equivalents | Level 2 | Commercial Paper |  |
Assets: |  |
Assets fair value | 20,492 | 17,245
Short-term Investments | Corporate Debt Securities |  |
Assets: |  |
Assets fair value | 83,978 | 77,898
Short-term Investments | Corporate Equity Securities |  |
Assets: |  |
Assets fair value | 2,476 |
Short-term Investments | U.S. Government Agency Bonds |  |
Assets: |  |
Assets fair value | 26,540 | 16,201
Short-term Investments | Asset-backed securities |  |
Assets: |  |
Assets fair value | 11,513 | 11,443
Short-term Investments | Level 2 | Corporate Debt Securities |  |
Assets: |  |
Assets fair value | 83,978 | 77,898
Short-term Investments | Level 2 | Corporate Equity Securities |  |
Assets: |  |
Assets fair value | 2,476 |
Short-term Investments | Level 2 | U.S. Government Agency Bonds |  |
Assets: |  |
Assets fair value | 26,540 | 16,201
Short-term Investments | Level 2 | Asset-backed securities |  |
Assets: |  |
Assets fair value | 11,513 | 11,443
Short-term investments, Municipal Bonds |  |
Assets: |  |
Assets fair value | 1,410 | 2,763
Short-term investments, Municipal Bonds | Level 2 |  |
Assets: |  |
Assets fair value | $ 1,410 | $ 2,763

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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=66048111&loc=d3e19207-110258 + Details
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