Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Foreign currency (Details)

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Summary of Significant Accounting Policies - Foreign currency (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Other (expense) income, net    
Foreign exchange (losses) gains $ (137,000) $ (15,257,000)