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Stockholders' Equity - Common Stock Warrants (Detail) (USD $)		6 Months Ended
	Oct. 13, 2006	Jun. 30, 2014 July 18, 2018 [Member] Common Stock [Member]	Jun. 30, 2014 January 16, 2019 [Member] Common Stock [Member]	Jun. 30, 2014 December 9, 2015 [Member] Common Stock [Member]	Jun. 30, 2014 January 30, 2019 [Member] Common Stock [Member]	Jun. 30, 2014 October 13, 2016 [Member] Common Stock [Member]
Class of Warrant or Right [Line Items]
Common stock warrants		298,404	301,987	17,042	15,250	1,544
Exercise price per share	$ 25.92	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 25.92
Expiration date		Jul. 18, 2018	Jan. 16, 2019	Dec. 09, 2015	Jan. 30, 2019	Oct. 13, 2016

X

- Definition

Class of warrant or right expiration date.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Number 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))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

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X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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