Segments - Segment Reporting Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Jul. 31, 2013
Revenue, Major Customer [Line Items]
Revenue	$ 4,505	$ 4,779	$ 14,419	$ 15,094
Net (loss) income from operations	(183)	(22)	(745)	(194)
Total assets	13,906		13,906		13,115
Allowance for doubtful accounts	158		158		285
Depreciation and amortization			123	71
Communications Systems and Services [Member]
Revenue, Major Customer [Line Items]
Revenue		323		983
Net (loss) income from operations		(83)		(387)
Total assets		0		0
Capital expenditures		0		0
Allowance for doubtful accounts		0		0
Depreciation and amortization		1		4
Telephony Products [Member]
Revenue, Major Customer [Line Items]
Revenue	2,292	2,871	7,386	8,353
Net (loss) income from operations	(184)	111	(578)	251
Total assets	0	0	0	0
Capital expenditures	0	3	51	122
Allowance for doubtful accounts	0	0	0	0
Depreciation and amortization	15	13	49	34
Puerto Rico [Member]
Revenue, Major Customer [Line Items]
Revenue	2,213	1,908	7,033	6,741
Net (loss) income from operations	1	63	(167)	182
Total assets	0	0	0	0
Capital expenditures	5	56	27	97
Allowance for doubtful accounts	0	0	0	0
Depreciation and amortization	27	14	74	33
Total [Member]
Revenue, Major Customer [Line Items]
Revenue	4,505	5,102	14,419	16,077
Net (loss) income from operations	(183)	91	(745)	46
Total assets	0	0	0	0
Capital expenditures	5	59	78	219
Allowance for doubtful accounts	0	0	0	0
Depreciation and amortization	$ 42	$ 28	$ 123	$ 71