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Warrants Issued to Purchase Common Stock (Detail)	12 Months Ended
	Dec. 31, 2012
Class of Warrant or Right [Line Items]
Outstanding	10,913,873
2007 Loan Agreement
Class of Warrant or Right [Line Items]
Shares Issuable	3,550,000
Outstanding	1,800,000
Warrant One | 2007 Loan Agreement
Class of Warrant or Right [Line Items]
Warrant Issuance Date	Jul. 18, 2007
Shares Issuable	1,250,000
Expiration Date	Feb. 26, 2014
Exercise Price per Share	5.13
Outstanding	1,250,000
Warrant Two | 2007 Loan Agreement
Class of Warrant or Right [Line Items]
Warrant Issuance Date	Oct. 18, 2007
Shares Issuable	1,300,000
Expiration Date	Feb. 26, 2014
Exercise Price per Share	1.68
Outstanding	250,000
Warrant Three | 2007 Loan Agreement
Class of Warrant or Right [Line Items]
Warrant Issuance Date	Dec. 27, 2007
Shares Issuable	300,000
Expiration Date	Feb. 26, 2014
Exercise Price per Share	5.65
Outstanding	300,000
Warrant Four | 2007 Loan Agreement
Class of Warrant or Right [Line Items]
Warrant Issuance Date	Dec. 27, 2007
Shares Issuable	700,000
Expiration Date	Feb. 26, 2014
Exercise Price per Share	1.68

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- Definition

Issuance Of Warrants For Common Stock Shares To Be Purchased

+ References

No definition available.

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- Definition

Warrant, Expiration Date

+ References

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X

- Definition

Warrant Issue Date

+ References

No definition available.

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X

- Definition

The exercise price of each class 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=6881521&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

-Subparagraph 4

-Article 4

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Aggregate amount of each class of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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=6881521&loc=d3e23780-122690



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant