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Accounts Payable and Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Payables and Accruals [Abstract] |
Summary of Accounts Payable and Accrued Liabilities | The following is a summary of the Company’s accounts payable and accrued liabilities as of December 31, 2020 and 2019:
(in thousands) | December 31, 2020 |  | December 31, 2019
Compensation and employee benefits | $ | 10,951 |  |  | $ | 6,597 |
Research and development expenses | 6,173 |  |  | 5,893 |
Royalties payable | 5,817 |  |  | 5,904 |
Consulting and other professional fees | 5,052 |  |  | 5,376 |
Operating lease liabilities | 2,117 |  |  | 2,147 |
Milestone obligations under license agreements | 350 |  |  | — |
Other | 1,049 |  |  | 1,673 |
Total accounts payable and accrued liabilities | $ | 31,509 |  |  | $ | 27,590 |

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- Definition Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses. + References No definition available. + Details
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