Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details)

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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 5,304 $ 5,507 $ 11,340  
Restricted cash 6,096 5,246 5,536  
Total cash and cash equivalents and restricted cash $ 11,400 $ 10,753 $ 16,876 $ 7,185