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, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]            
Cash and cash equivalents $ 11,340 $ 2,765     $ 1,844  
Restricted cash 5,536 $ 4,420     1,464  
Total cash and cash equivalents and restricted cash $ 16,876   $ 3,308 $ 7,185 $ 3,308 $ 4,843