Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Research and Development Expenditure (Details)

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Summary of Significant Accounting Policies - Research and Development Expenditure (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies    
Acquired in-process R&D expensed $ 4,556,000 $ 210,000
Reimbursement of Research and Development Tax and Expenditure Credit $ 18,649,000 $ 17,299,000