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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Period
Region
Dec. 31, 2013
Jun. 30, 2013
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]          
Number of regions in which company sells products     3    
Cash and Cash Equivalents [Abstract]          
Credit card receivables $ 2,700,000   $ 2,700,000 $ 600,000  
Cash and cash equivalents held in foreign bank accounts 23,100,000   23,100,000 14,700,000  
Restricted Cash [Abstract]          
Restricted cash 5,900,000   5,900,000 5,800,000  
Accounts Receivable [Abstract]          
Allowance for doubtful accounts 300,000   300,000 100,000  
Other Assets [Abstract]          
Other assets 3,913,000   3,913,000 3,591,000  
Deposits for building leases 1,700,000   1,700,000 1,400,000  
Fair trade commission deposits 1,800,000   1,800,000 1,800,000  
Indefinite lived intangible assets 200,000   200,000 200,000  
Other Long-Term Liabilities [Abstract]          
Other long-term liabilities 2,227,000   2,227,000 2,101,000  
Uncertain income tax position 700,000   700,000 700,000  
Accrued lease restoration costs 400,000   400,000 200,000  
Estimated defined benefit obligation related to a non-U.S. defined benefit plan for its Japan operations 700,000   700,000 600,000  
Revenue Recognition and Deferred Commissions [Abstract]          
Deferred revenue 11,300,000   11,300,000 6,400,000  
Deferred revenue associated with the loyalty program 9,136,000 0 9,136,000 5,456,000 0
Deferred commissions 4,784,000   4,784,000 2,706,000  
Loyalty Program [Abstract]          
Loyalty deferred revenue, beginning balance     5,456,000 0  
Loyalty points forfeited     (2,231,000) (1,136,000)  
Loyalty points used     (4,619,000) (723,000)  
Loyalty points vested     7,342,000 5,072,000  
Loyalty points unvested     3,188,000 2,243,000  
Loyalty deferred revenue, ending balance 9,136,000 0 9,136,000 5,456,000 0
Percentage of sale returns (in hundredths)     1.50%    
Shipping and Handling Costs [Abstract]          
Revenue from freight and shipping fees 1,800,000 1,900,000 3,700,000   3,800,000
Freight costs 1,700,000 1,700,000 3,300,000   3,300,000
Commissions and Incentives [Abstract]          
Number of business periods per year     13    
Number of days per business period     28 days    
Number of weeks following business period end for payment of product sales commissions     Three weeks    
Number of weeks following business period end for payment of pack sales commissions     Five weeks    
Commissions and Incentives Expense 19,782,000 19,181,000 36,750,000   36,722,000
Reserve for Sales Returns [Member]
          
Movement in Valuation Allowances and Reserves [Roll Forward]          
Sales reserve, beginning of year     238,000    
Provision related to sales made in current period     774,000    
Adjustment related to sales made in prior periods     10,000    
Actual returns or credits related to current period     (518,000)    
Actual returns or credits related to prior periods     (250,000)    
Sales reserve, end of period $ 254,000   $ 254,000