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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2012
Customer
Jul. 31, 2011
Customer
Jul. 31, 2012
Customer
Jul. 31, 2011
Customer
Jan. 31, 2012
Jan. 31, 2011
Jul. 31, 2012
Computer and Software
Jul. 31, 2012
Furniture and fixtures
Jul. 31, 2012
Machinery and Equipment
Jul. 31, 2012
Brokerage money market account
Jul. 31, 2012
Customer 1
Jul. 31, 2011
Customer 1
Jul. 31, 2012
Customer 1
Jan. 31, 2012
Customer 1
Jul. 31, 2011
Customer 1
Jul. 31, 2012
Customer 2
Jul. 31, 2011
Customer 2
Jul. 31, 2012
Customer 2
Jan. 31, 2012
Customer 2
Jul. 31, 2011
Customer 2
Jul. 31, 2012
Customer 3
Jul. 31, 2011
Customer 3
Jul. 31, 2012
Customer 3
Jan. 31, 2012
Customer 3
Jul. 31, 2011
Customer 3
Summary Of Significant Accounting Policies [Line Items]                                                  
Management agreement, initial term     20 years                                            
Number of major customers 3 3 3 3                                          
Revenue from major customers as percentage of total revenues                     25.80% 40.90% 26.00%   41.40% 11.00% 14.10% 10.70%   21.70% 10.70% 8.40% 9.70%   9.10%
Receivables from customers as percentage of total accounts receivable                         14.40% 14.10%       8.90% 9.00%       10.10% 4.20%  
Cash and cash equivalents $ 259,095 $ 343,150 $ 259,095 $ 343,150 $ 164,361 $ 397,101       $ 22,768                              
Property plant and equipment, useful life             3 years 8 years 5 years