Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Cash, cash equivalents and restricted cash (Details)

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Summary of Significant Accounting Policies - Cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of Significant Accounting Policies      
Cash and cash equivalents $ 50,412 $ 68,379  
Restricted cash 4,496 4,097  
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 54,908 $ 72,476 $ 88,296