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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sales Returns and Allowances, Goods $ 290,000us-gaap_SalesReturnsAndAllowancesGoods $ 525,000us-gaap_SalesReturnsAndAllowancesGoods  
Allowance for Doubtful Accounts Receivable 64,000us-gaap_AllowanceForDoubtfulAccountsReceivable 122,000us-gaap_AllowanceForDoubtfulAccountsReceivable  
Advertising Expense $ 17,000,000us-gaap_AdvertisingExpense $ 21,000,000us-gaap_AdvertisingExpense $ 26,000,000us-gaap_AdvertisingExpense
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 62,713us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount