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Fair Value Measurements - Summary of Fair Value Measurements of Company's Financial Assets (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Assets at fair value	$ 121,943	$ 128,094
Level 1 [Member]
Assets:
Assets at fair value	58,491	72,644
Level 2 [Member]
Assets:
Assets at fair value	63,452	55,450
Money Market Funds [Member]
Assets:
Assets at fair value	57,491	68,651
Money Market Funds [Member] | Level 1 [Member]
Assets:
Assets at fair value	57,491	68,651
U.S. Treasury Securities [Member]
Assets:
Assets at fair value	1,000	3,993
U.S. Treasury Securities [Member] | Level 1 [Member]
Assets:
Assets at fair value	1,000	3,993
Corporate Bonds [Member]
Assets:
Assets at fair value	29,820	26,827
Corporate Bonds [Member] | Level 2 [Member]
Assets:
Assets at fair value	29,820	26,827
Commercial Paper [Member]
Assets:
Assets at fair value	29,693	20,420
Commercial Paper [Member] | Level 2 [Member]
Assets:
Assets at fair value	29,693	20,420
Asset-Backed Securities [Member]
Assets:
Assets at fair value	3,939	8,203
Asset-Backed Securities [Member] | Level 2 [Member]
Assets:
Assets at fair value	$ 3,939	$ 8,203

X

- 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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