Segment, Customer and Geographic Information - Result of Operations by Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Results of operations by segments
REVENUES	$ 27,625	$ 26,182	$ 53,951	$ 49,837
GROSS PROFIT	9,591	10,851	19,780	20,432
OPERATING INCOME (LOSS)	(1,665)	545	(1,761)	123
Depreciation	771	697	1,515	1,363
Intangible amortization	1,185	464	1,839	1,038
Capital expenditures	933	610	1,297	1,230
Operating Segments [Member] | Connected Solutions [Member]
Results of operations by segments
REVENUES	18,100	17,715	35,454	33,712
GROSS PROFIT	5,417	5,716	10,861	10,832
OPERATING INCOME (LOSS)	1,498	1,845	3,187	3,015
Depreciation	432	421	852	841
Intangible amortization	230	260	460	630
Capital expenditures	341	144	518	425
Operating Segments [Member] | RF Solutions [Member]
Results of operations by segments
REVENUES	9,583	8,574	18,634	16,295
GROSS PROFIT	4,173	5,129	8,908	9,587
OPERATING INCOME (LOSS)	(347)	1,645	786	2,659
Depreciation	273	190	519	351
Intangible amortization	955	204	1,379	408
Capital expenditures	550	434	684	684
Corporate [Member]
Results of operations by segments
REVENUES	(58)	(107)	(137)	(170)
GROSS PROFIT	1	6	11	13
OPERATING INCOME (LOSS)	(2,816)	(2,945)	(5,734)	(5,551)
Depreciation	66	86	144	171
Intangible amortization	0	0	0	0
Capital expenditures	$ 42	$ 32	$ 95	$ 121