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CAPITALIZED FEES PAID TO A RELATED PARTY (Tables) | 12 Months Ended
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Dec. 31, 2020
CAPITALIZED FEES PAID TO A RELATED PARTY |
Schedule of 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

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- Definition Tabular disclosure of cost capitalized in obtaining or fulfilling contract with customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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