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Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) (USD $)
 6 Months Ended
Oct. 31, 2013
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 1 $ 0.44
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 2 227,541
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 3 172,704
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 4 227,541
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 5 172,704
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 6 0.47
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 7 173,270
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 8 126,314
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 9 173,270
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 10 126,314
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 11 0.60
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 12 388,873
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 13 232,935
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 14 372,527
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 15 223,144
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 16 0.62
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 17 850,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 18 492,150
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 19 850,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 20 492,150
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 21 1.41
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 22 100,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 23 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 24 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 25 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 26 1.44
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 27 250,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 28 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 29 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 30 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 31 1.53
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 32 200,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 33 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 34 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 35 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 36 1.70
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 37 750,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 38 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 39 343,749
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 40 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 41 1.88
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 42 30,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 43 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 44 6,250
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 45 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 46 1.90
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 47 916,875
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 48 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 49 290,832
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 50 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 51 2.00
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 52 12,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 53 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 54 12,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 55 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 56 2.15
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 57 240,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 58 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 59 240,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 60 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 61 2.26
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 62 200,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 63 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 64 37,302
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 65 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 66 2.27
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 67 52,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 68 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 69 33,584
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 70 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 71 2.90
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 72 305,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 73 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 74 95,313
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 75 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 76 4,695,559
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 77 1,024,103
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 78 2,682,368
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 79 1,014,312
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 80 3,930,818
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 81 2,636,687
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 82 2,677,887
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 83 $ 2,464,253