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Summary of Transactions with Raytheon (Detail) (Raytheon, Inc., USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Raytheon, Inc.
     
Related Party Transaction [Line Items]      
Equipment sold to Raytheon $ 176us-gaap_RevenueFromRelatedParties
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$ 607us-gaap_RevenueFromRelatedParties
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$ 267us-gaap_RevenueFromRelatedParties
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Due from Raytheon $ 21us-gaap_AccountsReceivableRelatedParties
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$ 10us-gaap_AccountsReceivableRelatedParties
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