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Significant Accounting Policies - Advertising Expense (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Advertising expense $ 344us-gaap_AdvertisingExpense $ 322us-gaap_AdvertisingExpense $ 152us-gaap_AdvertisingExpense