Other Long-Term Liabilities (Schedule Of Other Long-Term Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Apr. 30, 2013
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	$ 1,220	$ 1,429
Other - Severance For French Employees [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	140	140
Other - Long Term Deferred Support Revenue [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	661	761
Irving Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	11
Roseville Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	41
New York Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	180	101
New York Office [Member] | Unfavorable Lease Terms [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	25	131
San Francisco Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	55	82
New Jersey Office [Member] | Unfavorable Lease Terms [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	$ 107	$ 214