XML 47 R36.htm IDEA: XBRL DOCUMENT v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]      
Provision for estimated goods returns $ 525,000 $ 300,000  
Allowance for doubtful accounts 122,000 242,000  
Advertising Expense 24,000,000 31,000,000 27,000,000
Finite-Lived intangible asset, useful life 3 years    
Clinic Closure Costs 2,100,000    
Other Accrued Liabilities $ 1,300,000    
Maximum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Finite-Lived intangible asset, useful life 7 years    
Minimum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Finite-Lived intangible asset, useful life 2 years