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Share-Based Payments (Details 2)
 6 Months Ended
Oct. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding, Beginning Balance 2,004,002
Shares, Granted 89,169
Shares, Exercised 0
Shares, Forfeited (35,641)
Shares, Expired (79,769)
Shares, Outstanding, Ending Balance 1,977,761
Shares, Vested and expected to vest 1,977,761
Shares, Exercisable 1,551,416
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 5.74
Weighted Average Exercise Price, Granted | $ / shares 6.98
Weighted Average Exercise Price, Exercised | $ / shares 0
Weighted Average Exercise Price, Forfeited | $ / shares 6.53
Weighted Average Exercise Price, Expired | $ / shares 6.8
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares 5.74
Weighted Average Exercise Price, Vested and expected to vest | $ / shares 5.74
Weighted Average Exercise Price, Exercisable | $ / shares $ 5.85
Weighted Average Remaining Contractual Term, Outstanding, Beggining Balance (in years) 6 years 8 months 12 days
Weighted Average Remaining Contractual Life (Years), Granted 9 years 6 months
Weighted Average Remaining Contractual Term, Outstanding, Ending Balance (in years) 6 years 3 months 18 days
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest 6 years 3 months 18 days
Weighted Average Remaining Contractual Life (Years), Exercisable 5 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding, Beginning Balance | $ $ 4,166,000
Aggregate Intrinsic Value, Outstanding, Ending Balance | $ 927,000
Aggregate Intrinsic Value, Vested and expected to vest | $ 927,000
Aggregate Intrinsic Value, Exercisable | $ $ 719,000
Non-Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding, Beginning Balance 57,917
Shares, Granted 0
Shares, Exercised 0
Shares, Forfeited 0
Shares, Expired (6,667)
Shares, Outstanding, Ending Balance 51,250
Shares, Vested and expected to vest 51,250
Shares, Exercisable 34,271
Directors and Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding, Beginning Balance 1,946,085
Shares, Granted 89,169
Shares, Exercised 0
Shares, Forfeited (35,641)
Shares, Expired (73,102)
Shares, Outstanding, Ending Balance 1,926,511
Shares, Vested and expected to vest 1,926,511
Shares, Exercisable 1,517,145