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Accounts payable and accrued expenses - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Payables and Accruals [Abstract] |  |
Employee compensation, benefits, and related accruals | $ 31,595 | $ 53,291
Income tax payable | 618 | 4,315
Consulting and contracted research | 25,848 | 18,250
Professional fees | 4,975 | 3,614
Sales allowance | 59,431 | 54,327
Sales rebates | 58,351 | 63,774
Royalties | 27,457 | 16,575
Accounts payable | 20,820 | 18,665
Other | 6,826 | 9,357
Accounts payable and accrued expenses | $ 235,921 | $ 242,168

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