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Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 25,563 $ 18,743    
Restricted cash 1,138 1,135    
Cash, cash equivalents and restricted cash–discontinued operations 267 832    
Total cash, cash equivalents and restricted cash in the condensed consolidated statements of cash flows $ 26,968 $ 20,710 $ 15,444 $ 19,461