Annual report pursuant to Section 13 and 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
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 7,213 $ 5,507    
Restricted cash 5,546 5,246    
Total cash and cash equivalents and restricted cash $ 12,759 $ 10,753 $ 7,185 $ 4,843