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Collaboration and Licensing Agreements - Schedule of Changes in Deferred Revenue (Details) - 2019 KKC Agreement $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
Balance at December 31, 2019 | $ 4,541
Decreases due to revenue recognized in the period for which cash has been received | (1,828)
Decreases due to revenue recognized in the period for which cash has not been received | (1,828)
Balance at September 30, 2020 | $ 885

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