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Share-Based Payments (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Outstanding, Beginning Balance 14,866,038 14,320,948
Granted 741,250 1,495,000
Exercised 0 (50,000)
Canceled (25,000)  
Forfeited (551,250) (348,581)
Expired (1,140,833) (551,329)
Outstanding, Ending Balance 13,890,205 14,866,038
Vested and expected to vest 13,890,205 14,866,038
Exercisable 11,344,454 7,743,830
Weighted Average Exercise Price, Outstanding, Beginning Balance $ 0.88 $ 0.88
Weighted Average Exercise Price, Granted $ 0.41 $ 0.77
Weighted Average Exercise Price, Exercised $ 0 $ 0.17
Weighted Average Exercise Price, Canceled $ 0.62  
Weighted Average Exercise Price, Forfeited $ 0.72 $ 0.94
Weighted Average Exercise Price, Expired $ 0.95 $ 0.60
Weighted Average Exercise Price, Outstanding, Ending Balance $ 0.85 $ 0.88
Weighted Average Exercise Price, Vested and expected to vest   $ 0.88
Weighted Average Exercise Price, Exercisable $ 0.86 $ 0.89
Weighted Average Remaining Contractual Term, Outstanding, Beginning Balance (in years) 7 years 7 months 6 days 8 years 4 months 24 days
Weighted Average Remaining Contractual Term, Outstanding, Ending Balance (in years) 7 years 7 years 7 months 6 days
Weighted Average Remaining Contractual Term, Vested and expected to vest (in years) 7 years 7 years 7 months 6 days
Weighted Average Remaining Contractual Term, Exercisable (in years) 6 years 10 months 24 days 6 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding, Beginning Balance $ 0 $ 1,780
Aggregate Intrinsic Value, Outstanding, Ending Balance 89,000 0
Aggregate Intrinsic Value, Vested and expected to vest 89,000 0
Aggregate Intrinsic Value, Exercisable $ 54,000 $ 0
Non-Employees [Member]
    
Outstanding, Beginning Balance 1,410,000 1,610,000
Granted 130,000 115,000
Exercised 0 (50,000)
Canceled 0  
Forfeited 0 0
Expired (775,000) (265,000)
Outstanding, Ending Balance 765,000 1,410,000
Vested and expected to vest 765,000 1,410,000
Exercisable 458,334 1,241,667
Directors and Employees [Member]
    
Outstanding, Beginning Balance 13,456,038 12,710,948
Granted 611,250 1,380,000
Exercised 0 0
Canceled (25,000)  
Forfeited (551,250) (348,581)
Expired (365,833) (286,329)
Outstanding, Ending Balance 13,125,205 13,456,038
Vested and expected to vest 13,125,205 13,456,038
Exercisable 10,886,120 6,502,163