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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Royalty revenue from a related party | GSK |  |  |  |
Amortization of capitalized fees paid to a related party | $ 3,456 | $ 3,456 | $ 10,368 | $ 10,368

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