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Summary of Significant Accounting Policies - Outstanding Options, Warrants and Restricted Stock Units (Detail)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Class of Stock [Line Items]
Outstanding options, warrants and restricted stock units	13,662,749	12,680,199
Options [Member]
Class of Stock [Line Items]
Outstanding options, warrants and restricted stock units	431,558	474,917
Restricted stock units [Member]
Class of Stock [Line Items]
Outstanding options, warrants and restricted stock units	3,336,282	1,516,199
Warrant liabilities [Member]
Class of Stock [Line Items]
Outstanding options, warrants and restricted stock units	9,894,909	10,689,083

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

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