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Build-to-Suit Lease - Additional Information (Detail) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2015 ft² Option | Jun. 30, 2017 USD ($)
Operating Leased Assets [Line Items] |  |
Property leased | ft² | 41,400 |
Lease expiration date |  | Dec. 31, 2016
Operating lease expiration period | 5 years |
Number of lease term extension options | Option | 2 |
Costs capitalized | $ |  | $ 3.8
Maximum [Member] |  |
Operating Leased Assets [Line Items] |  |
Lease agreement, extendable lease term | 10 years |

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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