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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2015
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]  
Estimated useful lives of fixed assets
The estimated useful lives of fixed assets are as follows:

 
Estimated useful life
Office furniture and equipment
5 to 7 years
Computer hardware and software
3 to 5 years
Automobiles
3 to 5 years
Leasehold improvements(1)
2 to 10 years
 

(1) The Company amortizes leasehold improvements over the shorter of the useful estimated life of the leased asset or the lease term.
Loyalty deferred revenue
Deferred commissions were $3.4 million and $4.5 million at December 31, 2015 and December 31, 2014, respectively.

Loyalty program
 
(in thousands)
 
Loyalty deferred revenue as of January 1, 2014
 
$
5,456
 
Loyalty points forfeited
  
(4,664
)
Loyalty points used
  
(12,348
)
Loyalty points vested
  
19,580
 
Loyalty points unvested
  
1,679
 
Loyalty deferred revenue as of December 31, 2014
 
$
9,703
 

Loyalty deferred revenue as of January 1, 2015
 
$
9,703
 
Loyalty points forfeited
  
(8,801
)
Loyalty points used
  
(15,077
)
Loyalty points vested
  
20,403
 
Loyalty points unvested
  
1,845
 
Loyalty deferred revenue as of December 31, 2015
 
$
8,073
 
Sales return reserve
For the year ended December 31, 2015 our sales return reserve consisted of the following (in thousands):

  
December 31, 2015
 
Sales reserve as of January 1, 2015
 
$
207
 
Provision related to sales made in current period
  
1,456
 
Adjustment related to sales made in prior periods
  
(10
)
Actual returns or credits related to current period
  
(1,319
)
Actual returns or credits related to prior periods
  
(187
)
Sales reserve as of December 31, 2015
 
$
147
 
Concentration risk
Revenue from these products were as follows for the years ended December 31, 2015 and 2014 (in thousands, except percentages):

  
2015
  
2014
 
  
Sales by product
  
% of total net sales
  
Sales by product
  
% of total net sales
 
Advanced Ambrotose®
 
$
59,026
   
32.7
%
 
$
63,791
   
33.6
%
Ambrotose®
  
9,686
   
5.4
%
  
10,895
   
5.7
%
NutriVerus
  
8,541
   
4.7
%
  
10,530
   
5.5
%
PLUS™
  
8,239
   
4.6
%
  
8,923
   
4.7
%
Ūth™ Skin Rejuvenation
  
5,394
   
3.0
%
  
13,431
   
7.1
%
Total
 
$
90,886
   
50.4
%
 
$
107,571
   
56.6
%