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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies        
Cash and cash equivalents $ 13,344 $ 9,899 $ 11,652  
Restricted cash 235   113  
Total $ 13,579 $ 10,376 $ 11,765 $ 15,407