Segment, Customer and Geographic Information - Assets by Segment (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Accounts receivable	$ 18,337	$ 18,586
Inventories	16,108	17,573
Property and equipment, net	14,671	14,775
Long-term investment securities	0
Goodwill	161	161
Intangible assets, net	5,795	7,004
Deferred tax assets, net	12,989	14,034
Other noncurrent assets	1,727	1,636
Operating Segments [Member] | Connected Solutions [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Accounts receivable	12,136	11,885
Inventories	13,957	14,283
Property and equipment, net	11,541	11,868
Long-term investment securities	0
Goodwill	0	0
Intangible assets, net	3,614	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	6,201	6,701
Inventories	2,151	3,290
Property and equipment, net	1,933	1,746
Long-term investment securities	0
Goodwill	161	161
Intangible assets, net	2,181	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	1,197	1,161
Long-term investment securities	0
Goodwill	0	0
Intangible assets, net	0	0
Deferred tax assets, net	12,989	14,034
Other noncurrent assets	$ 1,727	$ 1,636