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Fair Value Measurements - Schedule of Fair Value of Company's Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Total financial assets | $ 105,435 | $ 111,325
Level 1 |  |
Assets |  |
Total financial assets | 5,722 | 45,937
Level 2 |  |
Assets |  |
Total financial assets | 99,713 | 65,388
Money Market Funds |  |
Assets |  |
Total financial assets | 5,722 | 45,937
Money Market Funds | Level 1 |  |
Assets |  |
Total financial assets | 5,722 | 45,937
U.S. Government Securities |  |
Assets |  |
Total financial assets | 35,917 | 16,490
U.S. Government Securities | Level 2 |  |
Assets |  |
Total financial assets | 35,917 | 16,490
Corporate Notes |  |
Assets |  |
Total financial assets | 15,666 | 23,927
Corporate Notes | Level 2 |  |
Assets |  |
Total financial assets | 15,666 | 23,927
Commercial Paper |  |
Assets |  |
Total financial assets | 48,130 | 24,971
Commercial Paper | Level 2 |  |
Assets |  |
Total financial assets | $ 48,130 | $ 24,971

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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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