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Fair Value Measurement - Summary of Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Derivative asset - embedded conversion feature | $ 111,877 | $ 80,651 | [1]
Fair Value Measurements Recurring [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Derivative asset - embedded conversion feature | 111,877 | 80,651 |
Fair Value Measurements Recurring [Member] | Level 3 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Derivative asset - embedded conversion feature | $ 111,877 | $ 80,651 |
[1] | Balances derived from audited financial statements as of December 31, 2016.

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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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