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Collaboration and Other Agreements - Incyte Corporation (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2017
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2018
Collaboration And Other Agreements [Line Items]              
Revenues   $ 18,253,000 $ 18,741,000   $ 52,192,000 $ 38,996,000  
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         30,000,000.0   $ 15,000,000.0
Collaborative agreement transaction price 154,000,000.0            
Incyte Corporation | Incyte MGA012 Agreement - Clinical activities              
Collaboration And Other Agreements [Line Items]              
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]              
Development and regulatory milestones recognized   15,000,000.0 15,000,000.0        
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 Agreement - Services              
Collaboration And Other Agreements [Line Items]              
Revenues   $ 700,000 $ 4,900,000   $ 8,100,000 $ 13,100,000