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Licensing and Other Arrangements - Zydus (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 03, 2020 USD ($) item | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Licensing and other arrangements |  |  |  |  |
Revenue from contracts with customers |  | $ 200 | $ 8,525 | $ 753 | $ 17,176
Zydus | License Agreement |  |  |  |  |
Licensing and other arrangements |  |  |  |  |
Maximum amount receivable milestone payments upon achievement of certain clinical development and regulatory approval events | $ 500 |  |  |  |
Maximum amount receivable upon achievement of commercial milestones | $ 23,500 |  |  |  |
Number of performance obligations | item | 1 |  |  |  |
Contract assets |  | 0 |  | 0 |
Contract liabilities |  | 0 |  | 0 |
Capitalized contract costs |  | 0 |  | 0 |
Revenue from contracts with customers |  | $ 0 |  | $ 0 |

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