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Intangibles and Other Assets - Schedule of Estimated Remaining Annual Amortization Expense for Purchased Patents (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2015 $ 20us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 6us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Total $ 26us-gaap_FiniteLivedIntangibleAssetsNet