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Fair Value Measurements - Schedule of Fair Value of Company's Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets
Total financial assets	$ 54,120	$ 73,411
Level 1
Assets
Total financial assets	23,613	10,606
Level 2
Assets
Total financial assets	30,507	62,805
Money Market Funds
Assets
Total financial assets	23,613	10,606
Money Market Funds | Level 1
Assets
Total financial assets	23,613	10,606
U.S. Government Securities
Assets
Total financial assets	3,477	9,975
U.S. Government Securities | Level 2
Assets
Total financial assets	3,477	9,975
Corporate Notes
Assets
Total financial assets	11,286	16,499
Corporate Notes | Level 2
Assets
Total financial assets	11,286	16,499
Commercial Paper
Assets
Total financial assets	15,744	36,331
Commercial Paper | Level 2
Assets
Total financial assets	$ 15,744	$ 36,331

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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