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Summary of Information with Regard to Outstanding Warrants Issued in Connection with Equity and Debt Financings and Consultants (Detail)
12 Months Ended
Dec. 31, 2012
Mar. 28, 2012
Dec. 30, 2010
Jul. 02, 2008
Feb. 04, 2008
May 31, 2003
Dec. 31, 2002
Aug. 31, 2001
Feb. 25, 2008
Warrant 4
Dec. 31, 2012
February 25, 2008 Common Stock Transaction
Warrant 4
Dec. 31, 2012
February 12, 2009 Series B-1 Transaction
Warrant 5
Dec. 31, 2012
February 12, 2009 Series B-1 Transaction
Warrant 6
Dec. 31, 2012
May 13, 2009 Series B-2 Transaction
Warrant 5
Dec. 31, 2012
May 13, 2009 Series B-2 Transaction
Warrant 6
Dec. 31, 2012
June 30, 2009 Series B-2 Transaction
Warrant 5
Dec. 31, 2012
June 30, 2009 Series B-2 Transaction
Warrant 6
Dec. 31, 2012
April 15, 2009 Consultant Warrants
Dec. 31, 2012
May 1, 2009 Consultant Warrants
Dec. 31, 2012
June 30, 2009 Consultant Warrants
Dec. 31, 2012
July 26, 2009 Consultant Warrants
Dec. 31, 2012
August 12, 2009 Series B-2 Transaction
Warrant 5
Dec. 31, 2012
August 12, 2009 Series B-2 Transaction
Warrant 6
Dec. 31, 2012
September 30, 2009 Series B-2 Transaction
Warrant 5
Dec. 31, 2012
September 30, 2009 Series B-2 Transaction
Warrant 6
Dec. 31, 2012
November 4, 2009 Series B-2 Transaction
Warrant 5
Dec. 31, 2012
November 4, 2009 Series B-2 Transaction
Warrant 6
Dec. 31, 2012
December 8, 2009 Series B-2 Transaction
Warrant 5
Dec. 31, 2012
December 8, 2009 Series B-2 Transaction
Warrant 6
Dec. 31, 2012
January 29, 2010 Series B-2 Transaction
Warrant 5
Dec. 31, 2012
January 29, 2010 Series B-2 Transaction
Warrant 6
Dec. 31, 2012
March 8, 2010 Series B-2 Transaction
Warrant 5
Dec. 31, 2012
March 8, 2010 Series B-2 Transaction
Warrant 6
Dec. 31, 2012
April 30, 2010 Series B-2 Transaction
Warrant 5
Dec. 31, 2012
April 30, 2010 Series B-2 Transaction
Warrant 6
Dec. 31, 2012
May 10, 2010 Series B-2 Transaction
Warrant 5
Dec. 31, 2012
May 10, 2010 Series B-2 Transaction
Warrant 6
Dec. 31, 2012
May Twenty Five Twenty Ten Consultant Warrants
First Issuance
Dec. 31, 2012
May Twenty Five Twenty Ten Consultant Warrants
Second Issuance
Dec. 31, 2012
June 15, 2010 Consultant Warrants
Dec. 31, 2012
December 9, 2010 Consultant Warrants
Dec. 31, 2012
December 30, 2010 Placement Agent Warrants
Dec. 31, 2012
March Twenty Eight Twenty Twelve Offering Warrants
Dec. 31, 2012
Twenty Twelve Offering Placement Agent Warrants
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