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License Revenue with 3D Medicines, Inc. - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2020
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]            
Upfront cash payment received $ 7,500,000       $ 9,500,000  
Future milestone payments received $ 194,500,000          
Royalties payable, maximum term 15 years          
Royalties payable, minimum term 10 years          
Performance obligation, amount $ 9,500,000          
Milestones probable of being achieved $ 2,000,000.0          
Milestone payment received   $ 1,000,000.0 $ 1,000,000.0   2,000,000.0  
Potential milestone payments to be received         192,500,000  
Licensing revenue   1,900,000   $ 0 7,600,000 $ 0
Contract acquisition costs   1,400,000     1,400,000  
Amortization of contract asset   300,000   0 1,100,000 0
Cost of licensing revenue   $ 100,000   $ 0 $ 200,000 $ 0