Concentrations, Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Aug. 21, 2013	Jul. 31, 2013
Total accounts receivable	39.00%	52.00%
Total revenue	40.00%	44.00%
Commitment for inventory purchases	$ 1,603,000
Accounts receivable and inventories	1,000,000
Interest rate of loan	4.00%
Trade accounts receivable	800,000
Interest Rate Base	2.00%
Income Tax Examination Possible Losses	320,000
Income Tax Examination Possible Losses Including Interest And Penalties			551,000
Income Tax Examination, Penalties and Interest Accrued, Total	$ 96,000			$ 96,000
Cortelco Systems Puerto Rico [Member]
Line of credit, expiration date	Dec. 15, 2013
Agreement expiration period	Jan. 31, 2014
Customer One [Member]
Total accounts receivable	10.00%	22.00%
Total revenue	12.00%	19.00%
Customer Two [Member]
Total accounts receivable	10.00%	10.00%
Total revenue	11.00%	14.00%
Customer Three [Member]
Total accounts receivable	7.00%	7.00%
Total revenue	9.00%	7.00%
Customer Four [Member]
Total accounts receivable	7.00%	7.00%
Total revenue	8.00%	4.00%
Customer Five [Member]
Total accounts receivable	5.00%	6.00%