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Accounts payable and accrued expenses | 12 Months Ended
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Dec. 31, 2020
Payables and Accruals [Abstract] |
Accounts payable and accrued expenses | 7. Accounts payable and accrued expenses Accounts payable and accrued expenses at December 31, 2020 and 2019 consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2020 |  | 2019
Employee compensation, benefits, and related accruals | ​ | $ | 53,291 | ​ | $ | 38,390
Income tax payable | ​ | ​ | 4,315 | ​ | ​ | 499
Consulting and contracted research | ​ |  | 18,250 | ​ |  | 12,969
Professional fees | ​ |  | 3,614 | ​ |  | 3,562
Sales allowance | ​ |  | 54,327 | ​ |  | 38,579
Sales rebates | ​ |  | 63,774 | ​ |  | 29,268
Royalties | ​ | ​ | 16,575 | ​ | ​ | 13,729
Accounts payable | ​ |  | 18,665 | ​ |  | 10,324
Other | ​ |  | 9,357 | ​ |  | 11,956
Total | ​ | $ | 242,168 | ​ | $ | 159,276
​

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- Definition The entire disclosure for accounts payable, accrued expenses, and other liabilities that are classified as current at the end of the reporting period. + References No definition available. + Details
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