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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, 2017	Dec. 31, 2016
Assets:
Assets at fair value	$ 172,339	$ 197,185
Level 1 [Member]
Assets:
Assets at fair value	70,129	68,561
Level 2 [Member]
Assets:
Assets at fair value	102,210	128,624
Money Market Funds [Member]
Assets:
Assets at fair value	70,129	68,561
Money Market Funds [Member] | Level 1 [Member]
Assets:
Assets at fair value	70,129	68,561
Corporate Bonds [Member]
Assets:
Assets at fair value	46,067	58,410
Corporate Bonds [Member] | Level 2 [Member]
Assets:
Assets at fair value	46,067	58,410
Commercial Paper [Member]
Assets:
Assets at fair value	41,787	65,330
Commercial Paper [Member] | Level 2 [Member]
Assets:
Assets at fair value	41,787	65,330
Asset-Backed Securities [Member]
Assets:
Assets at fair value	14,356	4,884
Asset-Backed Securities [Member] | Level 2 [Member]
Assets:
Assets at fair value	$ 14,356	$ 4,884

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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