Summary of Information with Regard to Outstanding Warrants Issued in Connection with Equity and Debt Financings and Consultants (Detail)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2012
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Mar. 28, 2012
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Dec. 30, 2010
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Jul. 02, 2008
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Feb. 04, 2008
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May 31, 2003
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Dec. 31, 2002
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Aug. 31, 2001
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Feb. 25, 2008
Warrant 4
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Dec. 31, 2012
February 25, 2008 Common Stock Transaction
Warrant 4
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Dec. 31, 2012
February 12, 2009 Series B-1 Transaction
Warrant 5
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Dec. 31, 2012
February 12, 2009 Series B-1 Transaction
Warrant 6
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Dec. 31, 2012
May 13, 2009 Series B-2 Transaction
Warrant 5
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Dec. 31, 2012
May 13, 2009 Series B-2 Transaction
Warrant 6
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Dec. 31, 2012
June 30, 2009 Series B-2 Transaction
Warrant 5
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Dec. 31, 2012
June 30, 2009 Series B-2 Transaction
Warrant 6
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Dec. 31, 2012
April 15, 2009 Consultant Warrants
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Dec. 31, 2012
May 1, 2009 Consultant Warrants
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Dec. 31, 2012
June 30, 2009 Consultant Warrants
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Dec. 31, 2012
July 26, 2009 Consultant Warrants
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Dec. 31, 2012
August 12, 2009 Series B-2 Transaction
Warrant 5
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Dec. 31, 2012
August 12, 2009 Series B-2 Transaction
Warrant 6
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Dec. 31, 2012
September 30, 2009 Series B-2 Transaction
Warrant 5
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Dec. 31, 2012
September 30, 2009 Series B-2 Transaction
Warrant 6
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Dec. 31, 2012
November 4, 2009 Series B-2 Transaction
Warrant 5
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Dec. 31, 2012
November 4, 2009 Series B-2 Transaction
Warrant 6
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Dec. 31, 2012
December 8, 2009 Series B-2 Transaction
Warrant 5
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Dec. 31, 2012
December 8, 2009 Series B-2 Transaction
Warrant 6
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Dec. 31, 2012
January 29, 2010 Series B-2 Transaction
Warrant 5
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Dec. 31, 2012
January 29, 2010 Series B-2 Transaction
Warrant 6
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Dec. 31, 2012
March 8, 2010 Series B-2 Transaction
Warrant 5
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Dec. 31, 2012
March 8, 2010 Series B-2 Transaction
Warrant 6
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Dec. 31, 2012
April 30, 2010 Series B-2 Transaction
Warrant 5
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Dec. 31, 2012
April 30, 2010 Series B-2 Transaction
Warrant 6
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Dec. 31, 2012
May 10, 2010 Series B-2 Transaction
Warrant 5
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Dec. 31, 2012
May 10, 2010 Series B-2 Transaction
Warrant 6
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Dec. 31, 2012
May Twenty Five Twenty Ten Consultant Warrants
First Issuance
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Dec. 31, 2012
May Twenty Five Twenty Ten Consultant Warrants
Second Issuance
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Dec. 31, 2012
June 15, 2010 Consultant Warrants
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Dec. 31, 2012
December 9, 2010 Consultant Warrants
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Dec. 31, 2012
December 30, 2010 Placement Agent Warrants
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Dec. 31, 2012
March Twenty Eight Twenty Twelve Offering Warrants
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Dec. 31, 2012
Twenty Twelve Offering Placement Agent Warrants
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Equity [Line Items] | |||||||||||||||||||||||||||||||||||||||||||
Number Issued | 7,424,241 | 710,834 | 300,000 | 1,200,000 | 150,000 | 600,000 | 83,333 | 333,333 | 33,333 | 74,000 | 40,000 | 16,667 | 50,000 | 200,000 | 54,166 | 216,666 | 51,666 | 206,666 | 54,167 | 216,667 | 54,167 | 216,667 | 55,834 | 223,334 | 51,667 | 206,667 | 95,000 | 380,000 | 28,334 | 7,500 | 100,000 | 33,334 | 500 | 1,333,361 | 46,378 | ||||||||
Exercise Price | 7.20 | 6.00 | 9.00 | 32.40 | 21.00 | 39.00 | 3.78 | 4.20 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 3.00 | 4.50 | 15.00 | 4.26 | 3.90 | 7.20 | 5.63 | 5.63 | ||
Exercisable Date | Aug. 25, 2008 | Feb. 12, 2009 | Feb. 12, 2009 | May 13, 2009 | May 13, 2009 | Jun. 30, 2009 | Jun. 30, 2009 | Apr. 15, 2009 | May 01, 2009 | Jun. 30, 2009 | Jul. 26, 2009 | Aug. 12, 2009 | Aug. 12, 2009 | Sep. 30, 2009 | Sep. 30, 2009 | Nov. 04, 2009 | Nov. 04, 2009 | Dec. 08, 2009 | Dec. 08, 2009 | Jan. 29, 2010 | Jan. 29, 2010 | Mar. 08, 2010 | Mar. 08, 2010 | Apr. 30, 2010 | Apr. 30, 2010 | May 10, 2010 | May 10, 2010 | May 25, 2010 | May 25, 2010 | Jun. 15, 2010 | Dec. 09, 2010 | Dec. 30, 2010 | Mar. 28, 2012 | Mar. 28, 2012 | |||||||||
Expiration Date | May 02, 2016 | Aug. 25, 2013 | Feb. 12, 2014 | Feb. 12, 2014 | May 13, 2014 | May 13, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Apr. 15, 2013 | May 01, 2014 | Jun. 30, 2014 | Jul. 26, 2014 | Aug. 12, 2014 | Aug. 12, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Nov. 04, 2014 | Nov. 04, 2014 | Dec. 08, 2014 | Dec. 08, 2014 | Jan. 29, 2015 | Jan. 29, 2015 | Mar. 08, 2015 | Mar. 08, 2015 | Apr. 30, 2015 | Apr. 30, 2015 | May 10, 2015 | May 10, 2015 | May 25, 2014 | May 25, 2014 | Jun. 15, 2015 | Dec. 09, 2015 | Dec. 30, 2015 | Mar. 28, 2017 | May 02, 2016 |