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Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Cash and cash equivalents $ 17,769 $ 16,564  
Restricted cash 1,480 0  
Total cash, cash equivalents and restricted cash $ 19,249 $ 16,564 $ 9,863