Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Reconciliation of Cash (Details)

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Summary of Significant Accounting Policies - Reconciliation of Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of Significant Accounting Policies        
Cash and cash equivalents $ 35,724 $ 24,294    
Restricted cash 6,000 6,000    
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 41,724 $ 30,294 $ 36,507 $ 30,015