GROSS-TO-NET PRODUCT SALES AND SIGNIFICANT CUSTOMERS

The below table presents a GTN revenue (see Note 2(i)) product sales reconciliation for the accompanying Consolidated Statement of Operations:



	Year Ended December 31,
	2018					2017					2016
Gross product sales	$	190,825				$	245,797				$	244,770
Commercial rebates and government chargebacks	(68,976		)	(36.1	)%	(105,148		)	(42.8	)%	(98,317		)	(40.2	)%
Data and distribution fees, GPO fees, and inventory management fees	(14,048		)	(7.4	)%	(20,083		)	(8.2	)%	(14,979		)	(6.1	)%
Prompt pay discounts	(1,553		)	(0.8	)%	(1,610		)	(0.7	)%	(755		)	(0.3	)%
Product returns	(1,782		)	(0.9	)%	(2,778		)	(1.1	)%	(2,123		)	(0.9	)%
Product sales, net	$	104,466		54.7	%	$	116,178		47.3	%	$	128,596		52.5	%

The below table presents the customers that represent 10% or more of our gross product sales in 2018, 2017, and 2016:



	Year Ended December 31,
	2018				2017				2016
McKesson Corporation and its affiliates	69,320		36.3	%	76,363		31.1	%	75,952		31.0	%
AmerisourceBergen Corporation, and its affiliates	$	55,576	29.1	%	$	79,362	32.3	%	$	93,951	38.4	%
Cardinal Health, Inc. and its affiliates	42,074		22.0	%	64,634		26.3	%	58,780		24.0	%
All other customers	23,855		12.5	%	25,438		10.3	%	16,087		6.6	%
Gross product sales	$	190,825	100.0	%	$	245,797	100.0	%	$	244,770	100.0	%