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Summary of Quarterly Results of Operations (Detail) (USD $)
 3 Months Ended 12 Months Ended
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2013
Jan. 31, 2012
Quarterly Financial Information [Line Items]                    
Revenues $ 2,529,683 $ 1,965,153 $ 1,649,451 $ 1,631,844 $ 1,545,440 $ 1,431,965 $ 1,093,708 $ 1,039,693 $ 7,776,131 $ 5,110,806
(Loss) income from operations (525,083) (1,437,225) (63,026) (53,153) (268,754) 126,202 (83,339) (187,444) (2,078,487) (413,335)
Loss on change in fair value of derivative liabilities 0 (3,063,144) (2,914,549) 123,838 0 0 0 0 (5,853,855) 0
Interest expense (259,995) (221,239) (224,906) (224,036) (154,060) (68,047) (40,978) (40,949) (930,176) (304,034)
Other (expense) income (37,903) 207 455 (5) 247 49 1,483 1,063 (37,246) 2,842
(Loss) income before income taxes (822,981) (4,721,401) (3,202,026) (153,356) (422,567) 58,204 (122,834) (227,330) (8,899,764) (714,527)
Provision for income taxes 0 0 800 4,000 4,219 0 0 1,600 4,800 5,819
Net (loss) income $ (822,981) $ (4,721,401) $ (3,202,826) $ (157,356) $ (426,786) $ 58,204 $ (122,834) $ (228,930) $ (8,904,564) $ (720,346)
Per share data:                    
Weighted Average Shares - Basic and Diluted 34,808,001 33,440,542 31,015,904 29,965,878 29,335,774 29,331,970 28,985,774 28,648,134 32,469,999 29,078,925
Basic and Diluted Loss per share $ (0.02) [1] $ (0.15) [1] $ (0.10) [1] $ (0.01) [1] $ (0.01) [1] $ 0.00 [1] $ 0.00 [1] $ (0.01) [1] $ (0.27) $ (0.02)
[1] Earnings per share are computed independently for each of the quarters presented and therefore may not sum to the total for the year