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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

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