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Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Provision for estimated returns $ 394,000 $ 323,000  
Allowance for doubtful accounts 55,000 94,000  
Advertising expense 9,400,000 15,300,000 $ 17,000,000
Research and development expense $ 2,000,000 $ 1,800,000 $ 1,300,000
Stock Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive awards 35,000 69,375 67,375
Restricted Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive awards 93