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Collaboration and Other Agreements - Incyte Corporation (Details)	1 Months Ended	3 Months Ended			39 Months Ended
	Oct. 31, 2017 USD ($) performanceObligation	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2021 USD ($)
Collaboration And Other Agreements [Line Items]
Revenues		$ 16,881,000	$ 13,682,000
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		10,000,000.0			$ 65,000,000.0
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
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Clinical Services
Collaboration And Other Agreements [Line Items]
Revenues		100,000	$ 5,900,000
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Supply Agreement
Collaboration And Other Agreements [Line Items]
Revenues		$ 3,100,000

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