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Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets HETLIOZ®. In January 2014, the Company announced that the FDA had approved the New Drug Application (NDA) for HETLIOZ®. As a result of this approval, the Company met a milestone under its license agreement with Bristol-Myers Squibb (BMS) that required the Company to make a license payment of $8.0 million to BMS. The $8.0 million is being amortized on a straight-line basis over the estimated economic useful life of the related product patents. In April 2018, the Company met its final milestone under its license agreement with BMS when cumulative worldwide sales of HETLIOZ® reached $250.0 million. As a result of the achievement of this milestone, the Company made a payment to BMS of $25.0 million in 2018. The $25.0 million, which was capitalized as an intangible asset in the first quarter of 2015, was determined to be additional consideration for the acquisition of the HETLIOZ® intangible asset and is being amortized on a straight-line basis over the estimated economic useful life of the related product patents. The estimated economic useful life of both the $8.0 million and the $25.0 million intangible assets were changed from February 2035 to July 2035 based on the July 2035 expiration date of U.S. patent number 10,376,487 (‘487 Patent) issued by the U.S. Patent and Trademark Office in August 2019. 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 |
As of December 31, 2020 and 2019, the Company also had $27.9 million of fully amortized intangible assets related to Fanapt®. Intangible assets are amortized over their estimated useful economic life using the straight-line method. 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 |
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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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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