Annual report pursuant to Section 13 and 15(d)

Segments - Schedule of Activities with Major Customers (Detail)

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Segments - Schedule of Activities with Major Customers (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Panasonic [Member]
     
Revenue, Major Customer [Line Items]      
Percent of Consolidated Revenue 29.60% 38.00% 35.70%
Accounts Receivable $ 14,090 $ 17,412  
Boeing [Member]
     
Revenue, Major Customer [Line Items]      
Percent of Consolidated Revenue 14.50% 5.50% 4.40%
Accounts Receivable $ 6,458 $ 1,939