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CAPITALIZED FEES PAID TO A RELATED PARTY | 12 Months Ended
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Dec. 31, 2020
CAPITALIZED FEES PAID TO A RELATED PARTY |
CAPITALIZED FEES PAID TO A RELATED PARTY | 6. CAPITALIZED FEES PAID TO A RELATED PARTY Capitalized fees paid to a related party, which consist of registrational and launch-related milestone fees paid to GSK, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | December 31,
(In thousands) |  | Amortization period |  | 2020 |  | 2019
United States |  | 2013-2030 | ​ | $ | 120,000 | ​ | $ | 120,000
Europe |  | 2013-2029 | ​ |  | 60,000 | ​ |  | 60,000
Japan |  | 2013-2029 | ​ |  | 40,000 | ​ |  | 40,000
Gross carrying value | ​ | ​ | ​ |  | 220,000 | ​ |  | 220,000
Accumulated amortization | ​ | ​ | ​ |  | (94,747) | ​ |  | (80,924)
Net carrying value | ​ | ​ | ​ | $ | 125,253 | ​ | $ | 139,076
​ These milestone fees are amortized over their estimated useful lives commencing upon the commercial launch of the product in their respective regions with the amortization expense recorded as a reduction in revenue from collaborative arrangements. As of December 31, 2020, the weighted average remaining amortization period was 9.1 years. Additional information regarding these milestone fees is included in Note 3, “Collaborative Arrangements.” Amortization expense for each of the years ended December 31, 2020, 2019 and 2018 was $13.8 million. The remaining estimated amortization expense is $13.8 million for each of the years from 2021 to 2025 and $56.3 million thereafter.

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