Segment, Customer and Geographic Information - Result of Operations by Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Results of operations by segments
REVENUES	$ 24,243	$ 27,625	$ 45,317	$ 53,951
GROSS PROFIT	9,237	9,349	16,288	19,519
OPERATING INCOME (LOSS)	(5,330)	(1,665)	(8,083)	(1,761)
Depreciation	799	771	1,591	1,515
Intangible amortization	744	1,185	1,513	1,839
Capital expenditures	693	933	1,392	1,297
Operating Segments [Member] | Connected Solutions [Member]
Results of operations by segments
REVENUES	15,781	18,100	30,480	35,454
GROSS PROFIT	4,941	5,417	9,265	10,861
OPERATING INCOME (LOSS)	1,792	1,498	3,094	3,187
Depreciation	468	432	933	852
Intangible amortization	44	230	114	460
Capital expenditures	264	341	843	518
Operating Segments [Member] | RF Solutions [Member]
Results of operations by segments
REVENUES	8,507	9,583	14,942	18,634
GROSS PROFIT	4,286	3,931	7,016	8,647
OPERATING INCOME (LOSS)	(4,372)	(347)	(5,896)	786
Depreciation	331	273	658	519
Intangible amortization	700	955	1,399	1,379
Capital expenditures	109	550	198	684
Corporate, Non-Segment [Member]
Results of operations by segments
REVENUES	(45)	(58)	(105)	(137)
GROSS PROFIT	10	1	7	11
OPERATING INCOME (LOSS)	(2,750)	(2,816)	(5,281)	(5,734)
Depreciation	0	66	0	144
Intangible amortization	0	0	0	0
Capital expenditures	$ 320	$ 42	$ 351	$ 95