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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	Dec. 31, 2016	Dec. 31, 2015
Assets:
Assets at fair value	$ 197,185	$ 81,910
Level 1 [Member]
Assets:
Assets at fair value	68,561	81,810
Level 2 [Member]
Assets:
Assets at fair value	128,624	100
Money Market Funds [Member]
Assets:
Assets at fair value	68,561	81,810
Money Market Funds [Member] | Level 1 [Member]
Assets:
Assets at fair value	68,561	81,810
Certificates of Deposit [Member]
Assets:
Assets at fair value		100
Certificates of Deposit [Member] | Level 2 [Member]
Assets:
Assets at fair value		$ 100
Corporate Bonds [Member]
Assets:
Assets at fair value	58,410
Corporate Bonds [Member] | Level 2 [Member]
Assets:
Assets at fair value	58,410
Commercial Paper [Member]
Assets:
Assets at fair value	65,330
Commercial Paper [Member] | Level 2 [Member]
Assets:
Assets at fair value	65,330
Asset-Backed Securities [Member]
Assets:
Assets at fair value	4,884
Asset-Backed Securities [Member] | Level 2 [Member]
Assets:
Assets at fair value	$ 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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