Segment, Customer and Geographic Information - Assets by Segment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]
Accounts receivable	$ 20,236	$ 18,603
Inventories	16,367	14,535
Property and equipment, net	14,898	14,971
Goodwill	161	161
Intangible assets, net	3,102	4,604
Deferred tax assets, net	10,685	11,827
Other noncurrent assets	39	41
Operating Segments [Member] | Connected Solutions [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Accounts receivable	13,587	11,934
Inventories	14,648	12,802
Property and equipment, net	11,175	11,508
Goodwill	0	0
Intangible assets, net	1,941	2,832
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	6,649	6,669
Inventories	1,719	1,733
Property and equipment, net	2,907	2,427
Goodwill	161	161
Intangible assets, net	1,161	1,772
Deferred tax assets, net	0	0
Other noncurrent assets	0	0
Corporate [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Accounts receivable	0	0
Inventories	0	0
Property and equipment, net	816	1,036
Goodwill	0	0
Intangible assets, net	0	0
Deferred tax assets, net	10,685	11,827
Other noncurrent assets	$ 39	$ 41