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License Revenue with 3D Medicines, Inc. - Deferred Revenue (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Movement in Deferred Revenue [Roll Forward]        
Beginning balance     $ 5,600,000  
Additions     2,000,000  
Revenue Recognized $ (1,900,000) $ 0 (7,600,000) $ 0
Ending balance $ 0   $ 0