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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

6 Months Ended

Jun. 30, 2012

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Schedule of antidilutive shares excluded from computation of diluted net loss per share

		June 30, 2011		June 30, 2012
Stock options		3,543,529		3,561,364
Unvested restricted stock and restricted stock units		44,255		308,969
Convertible preferred stock		516,228		516,228
Contingently issuable common stock and common stock warrants associated with economic rights		—		3,718,077
Options to purchase common stock and common stock warrants issued in connection with the October 2010 financing		6,242,398		—
Common stock warrants		10,005,192		13,814,015
Total shares excluded from calculation		20,351,602		21,918,653

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- Definition

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

+ 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 Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 40

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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