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Fair Value - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Liabilities |  |
Liability, fair value |  | $ 3,447,000
Fair Value, Measurements, Recurring [Member] |  |
Liabilities |  |
Liability, fair value | $ 0 |
Fair Value, Measurements, Recurring [Member] | Convertible Notes [Member] |  |
Liabilities |  |
Liability, fair value |  | 3,447,000
Level 2 [Member] |  |
Liabilities |  |
Liability, fair value |  | 3,447,000
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Convertible Notes [Member] |  |
Liabilities |  |
Liability, fair value |  | $ 3,447,000

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- Definition Fair value of financial and nonfinancial obligations. + 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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