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REVENUE (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [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, 2018, 2017 and 2016 (in thousands):
 
Returns Allowances
 
Prompt Payment Discounts
 
Wholesaler Service Fees
 
Volume Rebates and Chargebacks
 
Total
Balance at December 31, 2015
$
1,733

 
$
625

 
$
745

 
$
797

 
$
3,900

   Provision
694

 
5,448

 
4,118

 
2,611

 
12,871

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

 
657

 
839

 
696

 
3,013

   Provision
680

 
6,802

 
5,194

 
6,645

 
19,321

   Payments/Adjustments
(1,157
)
 
(6,680
)
 
(4,866
)
 
(6,331
)
 
(19,034
)
Balance at December 31, 2018
$
344

 
$
779

 
$
1,167

 
$
1,010

 
$
3,300
Disaggregation of Revenue
The following table represents disaggregated net product sales in the periods presented (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
 Net product sales:
 
 
 
 
 
      EXPAREL
$
331,112

 
$
282,905

 
$
265,802

      Other product sales
1,315

 
1,437

 
4,271

 Total net product sales
$
332,427

 
$
284,342

 
$
270,073