Segment, Customer and Geographic Information - Assets by Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Results of operations by segments
Accounts receivable	$ 20,643	$ 23,874
Inventories	17,187	16,358
Property and equipment, net	14,042	14,842
Goodwill	3,493	161
Intangible assets, net	12,434	2,637
Deferred tax assets, net	10,348	9,710
Other noncurrent assets	36	40
RF Solutions [Member]
Results of operations by segments
Goodwill	3,493
Operating Segments [Member] | Connected Solutions [Member]
Results of operations by segments
Accounts receivable	12,341	15,947
Inventories	14,761	14,172
Property and equipment, net	10,400	11,124
Goodwill	0	0
Intangible assets, net	620	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	8,302	7,927
Inventories	2,426	2,186
Property and equipment, net	3,027	2,987
Goodwill	3,493	161
Intangible assets, net	11,814	956
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	615	731
Goodwill	0	0
Intangible assets, net	0	0
Deferred tax assets, net	10,348	9,710
Other noncurrent assets	$ 36	$ 40