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Collaboration Agreements - Schedule of Revenue Recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Collaboration Agreements [Abstract]        
Amounts included in deferred revenue at the beginning of the period $ 184 $ 151 $ 505 $ 238