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Subsequent Events (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 03, 2021 | Oct. 06, 2021 | Oct. 21, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2017 | Dec. 31, 2015
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  |  | $ 550 | $ 200 | $ 1,094 | $ 753 |  |
Novartis International [Member] | License Agreement [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  | $ 25,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 10,000 | $ 37,000
Subsequent Event [Member] | Affitech | Commercial payment purchase agreement |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Amount of purchase price payment |  | $ 6,000 |  |  |  |  |  |  |
Payments eligible to receive as a percent of net sales |  | 0.50% |  |  |  |  |  |  |
Period over which entity is entitled to receive payments |  | 10 years |  |  |  |  |  |  |
Subsequent Event [Member] | Affitech | Commercial payment purchase agreement | Maximum [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Potential future cash payments |  | $ 20,000 |  |  |  |  |  |  |
Subsequent Event [Member] | Novartis International [Member] | License Agreement [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ 35,000 |  |  |  |  |  |  |  |

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