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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Summary of Activity in Accrued Rebates and Chargebacks, Returns, Wholsesaler Service Fees and Prompt Pay Discounts
The following table provides a summary of activity with respect to the Company’s sales related allowances and accruals for the years ended December 31, 2017, 2016 and 2015 (in thousands):

 
Returns Allowances
 
Prompt Payment Discounts
 
Wholesaler Service Fees
 
Volume Rebates and Chargebacks
 
Total
Balance at December 31, 2014
$
1,559

 
$
575

 
$
588

 
$
321

 
$
3,043

   Provision
339

 
4,905

 
3,482

 
2,020

 
10,746

   Payments/credits
(165
)
 
(4,855
)
 
(3,325
)
 
(1,544
)
 
(9,889
)
Balance at December 31, 2015
1,733

 
625

 
745

 
797

 
3,900

   Provision
694

 
5,448

 
4,118

 
2,611

 
12,871

   Payments/credits
(1,081
)
 
(5,478
)
 
(4,128
)
 
(2,284
)
 
(12,971
)
Balance at December 31, 2016
1,346

 
595

 
735

 
1,124

 
3,800

   Provision
716

 
5,806

 
4,403

 
4,656

 
15,581

   Payments/credits
(1,241
)
 
(5,744
)
 
(4,299
)
 
(5,084
)
 
(16,368
)
Balance at December 31, 2017
$
821

 
$
657

 
$
839

 
$
696

 
$
3,013
Schedule of percentage of revenue comprised by the three largest customers
The table below includes the percentage of revenue comprised by the Company’s three largest wholesalers in each year presented:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Largest wholesaler
35
%
 
32
%
 
33
%
Second largest wholesaler
30
%
 
28
%
 
29
%
Third largest wholesaler
26
%
 
26
%
 
28
%
 
91
%
 
86
%
 
90
%
Schedule of useful lives by asset category
Useful lives by asset category are as follows:
Asset Category
 
Useful Life
Computer equipment and software
 
1 to 3 years
Office furniture and equipment
 
5 years
Manufacturing and laboratory equipment
 
5 to 10 years