Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details 5)

Stockholders' Equity (Details 5) (USD $)	0 Months Ended	1 Months Ended		12 Months Ended				0 Months Ended			3 Months Ended		1 Months Ended		0 Months Ended			12 Months Ended			0 Months Ended	12 Months Ended			0 Months Ended		12 Months Ended				0 Months Ended			12 Months Ended
Stockholders' Equity (Details 5) (USD $)	Sep. 18, 2012 item investors	Sep. 30, 2012	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 05, 2012	Sep. 18, 2012 Minimum	Nov. 21, 2011 Exercise of September 2009 Warrants, the 2008 Warrants and the 2007 Warrants	Mar. 09, 2011 Exercise of the May 2009 Warrants, the 2008 Warrants and the 2007 Warrants	Mar. 31, 2011 Exercise of the May 2009 Warrants, the 2008 Warrants and the 2007 Warrants	Nov. 21, 2011 Warrants exercised on November 21, 2011	Mar. 31, 2012 March 2012	Mar. 31, 2013 March 2012	Jan. 09, 2012 January 2007 item	Nov. 21, 2011 January 2007 item	Mar. 09, 2011 January 2007 item	Mar. 31, 2012 January 2007	Mar. 31, 2011 January 2007	Mar. 31, 2010 January 2007	Nov. 21, 2011 September 2009 item	Mar. 31, 2012 September 2009	Mar. 31, 2011 September 2009	Mar. 31, 2010 September 2009	Nov. 21, 2011 September 2008 item	Mar. 09, 2011 September 2008 item	Mar. 31, 2012 September 2008	Mar. 31, 2011 September 2008	Mar. 31, 2013 September 2008	Mar. 31, 2010 September 2008	Mar. 09, 2011 September 2008 Warrants exercised on March 9, 2011	Nov. 21, 2011 September 2008 Warrants exercised on November 22, 2011	Mar. 09, 2011 May 2009 item	Mar. 31, 2011 May 2009	Mar. 31, 2010 May 2009
Stockholders' Equity
Common stock sold (in shares)			22,600,000
Common stock, par value (in dollars per share)			$ 0.001	$ 0.001	$ 0.001		$ 0.001
Number of shares of common stock under warrants issued							22,600,000					5,800,000			1,600,000	5,200,000	8,500,000								2,400,000							500,000	3,600,000
Exercise price (in dollars per share)	$ 1.26			$ 1.41			$ 1.55								$ 1.17	$ 1.17	$ 1.17				$ 1.34				$ 1.60	$ 1.60						$ 1.60	$ 0.95
Number of investors with whom Investor Agreement entered	1
Warrant unit price (in dollars per shares)			$ 1.11
Right to purchase maximum additional number of shares of common stock under put option				19,000,000
Number of trading days prior to the exercise of put option			30 days
Expenses incurred upon the exercise of warrants										$ 400,000			$ 1,900,000
Number of shares of common stock in each unit			1
Number of shares of common stock in each warrant			1
Arithmetic average of the average daily trading volumes on the exercise date (in shares)								1,750,000
Purchase price of additional shares determined pursuant to the Investor Agreement (in dollars per share)	$ 0.94
Net proceeds from exercise of warrants		4,200,000							8,400,000	11,200,000					1,600,000																	400,000
Number of warrants exercised (in shares)																		7,298,234	8,468,324			5,780,347					3,579,239	392,190			400,000			3,612,717
Proceeds from issuance of warrants				4,250,000	11,403,000	11,282,000							23,100,000
Number of Put Options	2
Number of holders of warrants															2	6	4				2				4	1							2
Outstanding warrants (in shares)				22,600,000									22,550,000	22,550,000					8,535,574	17,003,898			5,780,347	5,780,347			3,910,034	7,342,647	3,961,471	7,686,795					3,612,717
Fee on exercise of warrants															300,000	1,800,000	1,200,000				5,400,000				2,200,000	200,000						500,000	1,000,000
Amount charged against earnings for warrant revaluation prior to exercise of warrants											6,900,000
Reduction in amount charged against earnings for warrant revaluation due to induced exercise of warrants											1,000,000
Reduction of warrant liability											$ 9,700,000