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Stock Options - Summary of the grant-date fair value of stock options granted (Details) (USD $)
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Grant-date fair value $ 4.75    $ 5.69
Volatility factor 77.01%    85.92%
Dividend yield         
Risk-free interest rate 1.74%    1.49%
Expected term (in years) 10 years 0 years 7 years 91 days