Segment, Customer and Geographic Information - Result of Operations by Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Results of operations by segments
REVENUES	$ 26,526	$ 27,932	$ 80,477	$ 77,769
GROSS PROFIT	8,630	11,394	28,410	31,826
OPERATING INCOME (LOSS)	(2,221)	2,096	(3,982)	2,219
Depreciation	781	723	2,298	2,086
Intangible amortization	1,125	465	2,963	1,503
Capital expenditures	286	596	1,583	1,884
Operating Segments [Member] | Connected Solutions [Member]
Results of operations by segments
REVENUES	17,450	18,697	52,903	52,409
GROSS PROFIT	4,729	5,803	15,588	16,635
OPERATING INCOME (LOSS)	1,160	2,262	4,255	5,278
Depreciation	428	426	1,281	1,267
Intangible amortization	195	261	655	891
Capital expenditures	135	241	653	811
Operating Segments [Member] | RF Solutions [Member]
Results of operations by segments
REVENUES	9,115	9,283	27,749	25,578
GROSS PROFIT	3,894	5,584	12,802	15,171
OPERATING INCOME (LOSS)	(1,058)	2,492	(181)	5,150
Depreciation	289	211	809	562
Intangible amortization	930	204	2,308	612
Capital expenditures	151	345	836	1,036
Corporate, Non-Segment [Member]
Results of operations by segments
REVENUES	(39)	(48)	(175)	(218)
GROSS PROFIT	7	7	20	20
OPERATING INCOME (LOSS)	(2,323)	(2,658)	(8,056)	(8,209)
Depreciation	64	86	208	257
Intangible amortization	0	0	0	0
Capital expenditures	$ 0	$ 10	$ 94	$ 37