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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Intangible Assets | The following is a summary of the Company’s intangible assets as of December 31, 2020:
|  |  | December 31, 2020
(in thousands) | Estimated Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
HETLIOZ® | July 2035 |  | $ | 33,000 |  |  | $ | 11,441 |  |  | $ | 21,559 |
The following is a summary of the Company’s intangible assets as of December 31, 2019:
|  |  | December 31, 2019
(in thousands) | Estimated Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
HETLIOZ® | July 2035 |  | $ | 33,000 |  |  | $ | 9,963 |  |  | $ | 23,037 |
Summary of Amortization Expense | Amortization expense for the years ended December 31, 2020, 2019 and 2018 was as follows:
| Year Ended December 31,
(in thousands) | 2020 |  | 2019 |  | 2018
HETLIOZ® | $ | 1,478 |  |  | $ | 1,505 |  |  | $ | 1,527 |
Summary of Future Intangible Asset Amortization | The following is a summary of the future intangible asset amortization schedule as of December 31, 2020:
(in thousands) | Total |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Thereafter
HETLIOZ® | $ | 21,559 |  |  | $ | 1,478 |  |  | $ | 1,478 |  |  | $ | 1,478 |  |  | $ | 1,478 |  |  | $ | 1,478 |  |  | $ | 14,169 |

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