Segment, Customer and Geographic Information - Assets by Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Results of operations by segments
Accounts receivable	$ 18,191	$ 21,001
Inventories	15,190	17,596
Property and equipment, net	13,615	13,839
Goodwill	3,332	3,332
Intangible assets, net	5,141	11,378
Deferred tax assets, net	8,949	13,155
Other noncurrent assets	38	40
Operating Segments [Member] | Connected Solutions [Member]
Results of operations by segments
Accounts receivable	10,668	12,875
Inventories	12,628	15,507
Property and equipment, net	10,163	10,250
Goodwill	0	0
Intangible assets, net	311	425
Deferred tax assets, net	0	0
Other noncurrent assets	0	0
Operating Segments [Member] | RF Solutions [Member]
Results of operations by segments
Accounts receivable	7,523	8,126
Inventories	2,562	2,089
Property and equipment, net	2,624	2,985
Goodwill	3,332	3,332
Intangible assets, net	4,830	10,953
Deferred tax assets, net	0	0
Other noncurrent assets	0	0
Corporate, Non-Segment [Member]
Results of operations by segments
Accounts receivable	0	0
Inventories	0	0
Property and equipment, net	828	604
Goodwill	0	0
Intangible assets, net	0	0
Deferred tax assets, net	8,949	13,155
Other noncurrent assets	$ 38	$ 40