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Stockholders' Equity - Summary of Warrant Activity (Parenthetical) (Detail) - $ / shares	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Minimum [Member]
Outstanding, (in dollars per share)	$ 1.61	$ 11.84	$ 28

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: