Segment, Customer and Geographic Information - Assets by Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Results of operations by segments
Accounts receivable	$ 21,667	$ 23,874
Inventories	17,696	16,358
Property and equipment, net	14,628	14,842
Goodwill	4,123	161
Intangible assets, net	12,929	2,637
Deferred tax assets, net	9,710	9,710
Other noncurrent assets	36	40
Operating Segments [Member] | Connected Solutions [Member]
Results of operations by segments
Accounts receivable	12,389	15,947
Inventories	15,107	14,172
Property and equipment, net	10,788	11,124
Goodwill	0	0
Intangible assets, net	815	1,681
Deferred tax assets, net	0	0
Other noncurrent assets	0	0
Operating Segments [Member] | RF Solutions [Member]
Results of operations by segments
Accounts receivable	9,278	7,927
Inventories	2,589	2,186
Property and equipment, net	3,159	2,987
Goodwill	4,123	161
Intangible assets, net	12,114	956
Deferred tax assets, net	0	0
Other noncurrent assets	0	0
Corporate [Member]
Results of operations by segments
Accounts receivable	0	0
Inventories	0	0
Property and equipment, net	681	731
Goodwill	0	0
Intangible assets, net	0	0
Deferred tax assets, net	9,710	9,710
Other noncurrent assets	$ 36	$ 40