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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
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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 |

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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://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 + Details
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