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Revenue (Tables) | 9 Months Ended
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Sep. 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 | ​ | ​ | Nine Months Ended |
​ | ​ | September 30, 2022 |  | ​ | September 30, 2021 | ​ | ​ | September 30, 2022 |  | ​ | September 30, 2021 |
McKesson Corporation |  | 37 | % | ​ | 40 | % | ​ | 37 | % | ​ | 39 | %
AmeriSource-Bergen Corporation |  | 45 | % | ​ | 40 | % | ​ | 45 | % | ​ | 39 | %
Cardinal Health, Inc. |  | 17 | % | ​ | 19 | % | ​ | 17 | % | ​ | 20 | %
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:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 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 | ​ | ​ | 321,056 | ​ | ​ | 50,939 | ​ | ​ | 54,967 | ​ | ​ | 426,962
Prior period | ​ | ​ | (2,055) | ​ | ​ | (5,064) | ​ | ​ | (181) | ​ | ​ | (7,300)
Payments and customer credits issued | ​ |  | (320,022) | ​ | ​ | (64,869) | ​ | ​ | (61,829) | ​ | ​ | (446,720)
Balances at September 30, 2022 | ​ | $ | 28,644 | ​ | $ | 35,010 | ​ | $ | 19,011 | ​ | $ | 82,665
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 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 | ​ |  | 356,663 | ​ | ​ | 90,965 | ​ | ​ | 73,289 | ​ | ​ | 520,917
Prior period | ​ | ​ | (2,859) | ​ | ​ | (2,821) | ​ | ​ | (3,035) | ​ | ​ | (8,715)
Payments and customer credits issued | ​ |  | (362,241) | ​ |  | (78,600) | ​ |  | (75,716) | ​ |  | (516,557)
Balances at September 30, 2021 | ​ | $ | 32,143 | ​ | $ | 63,602 | ​ | $ | 23,298 | ​ | $ | 119,043

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