Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details 3)

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Fair Value Measurements (Details 3) (Warrants, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Warrants
     
Reconciliation of the beginning and ending balances for the warrant liability      
Balance at the beginning of the period $ 10 $ 791 $ 20,772
Total realized and unrealized (gains) losses, income included in change in fair value of warrant liability (10) (781) (13,872)
Purchases, issuances and settlements     (6,109)
Balance at the end of the period   $ 10 $ 791