Product Revenue, Net

Product revenue, net consists of revenue recorded from the sale of IMBRUVICA. The Company sells IMBRUVICA directly to some customers who have in-house dispensing capabilities, specialty pharmacies (SP) that sell to individual patients, specialty distributors (SD) that sell to hospital pharmacies and other organizations that the Company has contracted with.

The following table summarizes the provisions, and credits/payments, for product revenue, net of adjustments (in thousands):



	Total
Balance as of December 31, 2014	$	26,735
Provision related to current period product revenue	28,779
Credits/payments	(20,972		)
Balance as of March 31, 2015	$	34,542



	Total
Balance as of December 31, 2013	$	1,206
Provision related to current period product revenue	8,639
Credits/payments	(2,095		)
Balance as of March 31, 2014	$	7,750

The following table sets forth customers who represented 10% or more of the Company's product revenue, net for the three months ended March 31, 2015 and 2014:



	Three Months Ended
	March 31,
Customer	2015		2014
A	29	%	29	%
B	21	%	19	%
C	16	%	12	%
D	13	%	8	%
E	10	%	13	%