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Revenue Recognition and Collaborative Arrangements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue Recognition and Collaborative Arrangements |  |  |  |
Total net revenue from GSK | $ 64,107 | $ 67,086 | $ 119,290 | $ 119,466
GSK |  |  |  |
Revenue Recognition and Collaborative Arrangements |  |  |  |
Total net revenue from GSK | 64,107 | 67,086 | 119,290 | 119,466
GSK | Royalty revenue from a related party |  |  |  |
Revenue Recognition and Collaborative Arrangements |  |  |  |
Royalties from a related party | 67,563 | 70,542 | 126,202 | 126,378
Less: amortization of capitalized fees paid to a related party | (3,456) | (3,456) | (6,912) | (6,912)
GSK | RELVAR/BREO |  |  |  |
Revenue Recognition and Collaborative Arrangements |  |  |  |
Royalties from a related party | 47,086 | 57,515 | 89,826 | 103,675
GSK | ANORO |  |  |  |
Revenue Recognition and Collaborative Arrangements |  |  |  |
Royalties from a related party | 10,635 | 10,656 | 19,205 | 19,380
GSK | TRELEGY |  |  |  |
Revenue Recognition and Collaborative Arrangements |  |  |  |
Royalties from a related party | $ 9,842 | $ 2,371 | $ 17,171 | $ 3,323

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