Fair Value Measurement - Summary of Fair Value Measured on Recurring Basis (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative liability - embedded conversion feature	$ 120,848
Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative liability - embedded conversion feature	$ 120,848

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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=56946850&loc=SL5624163-113959

Name:	us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant