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Collaboration and Other Agreements - Incyte Corporation (Details)
 3 Months Ended 6 Months Ended 12 Months Ended 24 Months Ended 42 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2017
USD ($)
performanceObligation
Dec. 31, 2018
USD ($)
Jun. 30, 2021
USD ($)
Collaboration And Other Agreements [Line Items]              
Revenues $ 30,757,000 $ 20,257,000 $ 47,638,000 $ 33,939,000      
Incyte Corporation | Incyte MGA012 Agreement              
Collaboration And Other Agreements [Line Items]              
Non-refundable upfront payment         $ 150,000,000.0    
Potential development and regulatory milestone payments under agreement         420,000,000.0    
Potential commercial milestone payments under agreement         $ 330,000,000.0    
Development and regulatory milestones recognized 5,000,000.0   15,000,000.0       $ 70,000,000.0
Number of performance obligations | performanceObligation         2    
Collaborative agreement transaction price         $ 154,000,000.0    
Variable consideration recognized           $ 4,000,000.0  
Maximum | Incyte Corporation | Incyte MGA012 Agreement              
Collaboration And Other Agreements [Line Items]              
Potential proceeds from royalties (percent)         24.00%    
Minimum | Incyte Corporation | Incyte MGA012 Agreement              
Collaboration And Other Agreements [Line Items]              
Potential proceeds from royalties (percent)         15.00%    
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Agreement              
Collaboration And Other Agreements [Line Items]              
Revenues         $ 150,000,000.0    
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Agreement - Clinical activities              
Collaboration And Other Agreements [Line Items]              
Revenues   0   0      
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Clinical Services              
Collaboration And Other Agreements [Line Items]              
Revenues 700,000 $ 1,500,000 800,000 $ 7,400,000      
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Supply Agreement              
Collaboration And Other Agreements [Line Items]              
Revenues $ 2,800,000   $ 5,900,000