Segment, Customer and Geographic Information - Assets by Segment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Accounts receivable	$ 17,275	$ 18,586
Inventories	15,238	17,573
Property and equipment, net	14,619	14,775
Goodwill	161	161
Intangible assets, net	5,199	7,004
Deferred tax assets, net	12,441	14,034
Other noncurrent assets	1,796	1,636
Operating Segments [Member] | Connected Solutions [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Accounts receivable	11,231	11,885
Inventories	13,462	14,283
Property and equipment, net	11,520	11,868
Goodwill	0	0
Intangible assets, net	3,223	4,404
Deferred tax assets, net	0	0
Other noncurrent assets	0	0
Operating Segments [Member] | RF Solutions [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Accounts receivable	6,044	6,701
Inventories	1,776	3,290
Property and equipment, net	1,990	1,746
Goodwill	161	161
Intangible assets, net	1,976	2,600
Deferred tax assets, net	0	0
Other noncurrent assets	0	0
Consolidating [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Accounts receivable	0	0
Inventories	0	0
Property and equipment, net	1,109	1,161
Goodwill	0	0
Intangible assets, net	0	0
Deferred tax assets, net	12,441	14,034
Other noncurrent assets	$ 1,796	$ 1,636