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Fair Value Measurements - Summary of Fair Value Measurements of Company's Financial Assets and Liabilities (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets:
Assets at fair value	$ 209,799	$ 128,094
Liabilities
Derivative liability	546
Level 1 [Member]
Assets:
Assets at fair value	76,071	72,644
Level 2 [Member]
Assets:
Assets at fair value	133,728	55,450
Money Market Funds [Member]
Assets:
Assets at fair value	67,611	68,651
Money Market Funds [Member] | Level 1 [Member]
Assets:
Assets at fair value	67,611	68,651
U.S. Treasury Securities [Member]
Assets:
Assets at fair value	8,460	3,993
U.S. Treasury Securities [Member] | Level 1 [Member]
Assets:
Assets at fair value	8,460	3,993
Corporate Bonds [Member]
Assets:
Assets at fair value	41,421	26,827
Corporate Bonds [Member] | Level 2 [Member]
Assets:
Assets at fair value	41,421	26,827
Commercial Paper [Member]
Assets:
Assets at fair value	83,184	20,420
Commercial Paper [Member] | Level 2 [Member]
Assets:
Assets at fair value	83,184	20,420
Asset-Backed Securities [Member]
Assets:
Assets at fair value	9,123	8,203
Asset-Backed Securities [Member] | Level 2 [Member]
Assets:
Assets at fair value	$ 9,123	$ 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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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-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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