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Stockholders' Equity (Details 5) (USD $)
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0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||||||
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Sep. 18, 2012
item
investors
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Sep. 30, 2012
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Mar. 31, 2012
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2012
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Mar. 05, 2012
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Sep. 18, 2012
Minimum
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Nov. 21, 2011
Exercise of September 2009 Warrants, the 2008 Warrants and the 2007 Warrants
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Nov. 21, 2011
Warrants exercised on November 21, 2011
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Oct. 31, 2013
March 2012
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Mar. 31, 2012
March 2012
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Mar. 31, 2014
March 2012
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Mar. 31, 2013
March 2012
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Jan. 09, 2012
January 2007
item
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Nov. 21, 2011
January 2007
item
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Mar. 31, 2012
January 2007
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Mar. 31, 2011
January 2007
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Nov. 21, 2011
September 2009
item
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Mar. 31, 2012
September 2009
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Mar. 31, 2011
September 2009
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Nov. 21, 2011
September 2008
item
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Mar. 31, 2012
September 2008
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Mar. 31, 2013
September 2008
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Mar. 31, 2011
September 2008
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Nov. 21, 2011
September 2008
Warrants exercised on November 22, 2011
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| Stockholders' Equity | ||||||||||||||||||||||||||
| Common stock sold (in shares) | 22,600,000 | |||||||||||||||||||||||||
| Common stock, par value (in dollars per share) | $ 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 | 2,400,000 | 500,000 | ||||||||||||||||||||
| Exercise price (in dollars per share) | $ 1.26 | $ 1.41 | $ 1.55 | $ 1.17 | $ 1.17 | $ 1.34 | $ 1.60 | $ 1.60 | ||||||||||||||||||
| 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 | $ 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 | |||||||||||||||||||||||||
| Proceeds from exercise of warrants | 4,200,000 | 8,400,000 | 6,000,000 | 1,600,000 | 400,000 | |||||||||||||||||||||
| Number of warrants exercised (in shares) | 4,700,000 | 4,725,000 | 7,298,234 | 5,780,347 | 3,579,239 | |||||||||||||||||||||
| Proceeds from issuance of warrants | 5,954,000 | 4,250,000 | 11,403,000 | 23,100,000 | ||||||||||||||||||||||
| Number of Put Options | 2 | |||||||||||||||||||||||||
| Number of holders of warrants | 2 | 6 | 2 | 4 | ||||||||||||||||||||||
| Outstanding warrants (in shares) | 22,600,000 | 22,550,000 | 22,550,000 | 8,535,574 | 5,780,347 | 3,910,034 | 3,961,471 | 7,342,647 | ||||||||||||||||||
| Fee on exercise of warrants | $ 300,000 | $ 1,800,000 | $ 5,400,000 | $ 2,200,000 | $ 500,000 | |||||||||||||||||||||