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Summary of Stock-Based Compensation Expense Related to Common Stock and Common Stock Option Awards (Detail) (USD $)
3 Months Ended 6 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Summary Of Stock Based Compensation Expense Related To Common Stock and Common Stock Option Awards [Line Items]        
Stock-based compensation expense $ 1,045,487 $ 80,930 $ 1,668,713 $ 185,064
Cost of services
       
Summary Of Stock Based Compensation Expense Related To Common Stock and Common Stock Option Awards [Line Items]        
Stock-based compensation expense 329,263 (93,565) 477,158 12,509
General and administrative
       
Summary Of Stock Based Compensation Expense Related To Common Stock and Common Stock Option Awards [Line Items]        
Stock-based compensation expense $ 716,224 $ 174,495 $ 1,191,555 $ 172,555