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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Summary of Significant Accounting Policies        
Cash and cash equivalents $ 17,765 $ 15,294 $ 19,876  
Restricted cash 113   113  
Total $ 17,878 $ 15,407 $ 19,989 $ 16,482