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Collaboration and Other Agreements - Zai Lab (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |
Revenues |  | $ 10,593 | $ 18,834 | $ 20,255 | $ 23,529 |
Deferred revenue, current |  | 14,449 |  | 14,449 |  | $ 21,721
Deferred revenue, net of current portion |  | 15,413 |  | 15,413 |  | 19,001
Zai Labs Collaboration and License Agreement | Zai Labs |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |
Non-refundable upfront payment | $ 25,000 |  |  |  |  |
Nonrefundable payment tax withholding | $ 2,500 |  |  |  |  |
Potential development and regulatory milestone payments under agreement |  | 140,000 |  | 140,000 |  |
Revenues |  | 4,000 |  | 8,000 |  |
Deferred revenue |  | 13,100 |  | 13,100 |  | 21,100
Deferred revenue, current |  | 8,100 |  | 8,100 |  | 16,100
Deferred revenue, net of current portion |  | $ 5,000 |  | 5,000 |  | $ 5,000
Revenues From License Agreements | Zai Labs Collaboration and License Agreement | Zai Labs |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |
Revenues |  |  |  | $ 2,000 | $ 2,000 |

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