Revenue (Tables)

6 Months Ended

Jun. 30, 2022

Revenue

Gross Revenues by Significant Customer as a Percentage of Total Gross Revenues

Gross revenues by significant customer as a percentage of total gross revenues are as follows:

	Three Months Ended				Six Months Ended
	June 30, 2022		June 30, 2021		June 30, 2022		June 30, 2021
McKesson Corporation	36	%	39	%	37	%	39	%
AmeriSource-Bergen Corporation	46	%	38	%	45	%	38	%
Cardinal Health, Inc.	17	%	22	%	17	%	21	%

Activities and Ending Reserve Balances for Each Significant Category of Discounts and Allowances

The activities and ending reserve balances for each significant category of discounts and allowances, which constitute variable consideration, were as follows:

	Six Months Ended June 30, 2022
	Chargebacks				Other Fees,
	and Discounts				Co-pay
	for Prompt				Assistance
(in thousands)	Payment		Rebates		and Returns		Total
Balances at December 31, 2021	$	29,665	$	54,004	$	26,054	$	109,723
Provision related to sales made in:
Current period		220,178		38,075		39,353		297,606
Prior period		(2,147)		(3,165)		(556)		(5,868)
Payments and customer credits issued		(216,130)		(44,816)		(44,402)		(305,348)
Balances at June 30, 2022	$	31,566	$	44,098	$	20,449	$	96,113

	Six Months Ended June 30, 2021
	Chargebacks				Other Fees,
	and Discounts				Co-pay
	for Prompt				Assistance
(in thousands)	Payment		Rebates		and Returns		Total
Balances at December 31, 2020	$	40,580	$	54,058	$	28,760	$	123,398
Provision related to sales made in:
Current period		237,745		61,190		50,039		348,974
Prior period		(2,850)		(1,890)		(2,818)		(7,558)
Payments and customer credits issued		(247,641)		(52,213)		(50,726)		(350,580)
Balances at June 30, 2021	$	27,834	$	61,145	$	25,255	$	114,234