Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Revenue from contract with customers (Details)

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Summary of Significant Accounting Policies - Revenue from contract with customers (Details) - GlaxoSmithKline Intellectual Property Development Ltd - Collaboration and License Agreement
12 Months Ended
Dec. 31, 2019
USD ($)
contract
Collaboration and License Agreement  
Number of contracts with customers | contract 1
Amount of development milestone achieved $ 3,200,000
Estimate of variable consideration $ 0