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Net Loss Per Share (Common Shares Excluded from Net Loss) (Detail)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares of common stock issuable upon the exercise which were excluded from the computation of diluted earnings per share 19,626 22,377
Warrants to purchase common stock [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares of common stock issuable upon the exercise which were excluded from the computation of diluted earnings per share 9,460 12,405
Options to purchase common stock [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares of common stock issuable upon the exercise which were excluded from the computation of diluted earnings per share 10,166 9,972