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Significant Accounting Policies - Schedule of Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and Cash Equivalents $ 15,617 $ 16,283 $ 17,198  
Restricted Cash, Current Portion 735 0 0  
Restricted Cash, Less Current Portion 5,247 0 0  
Total Cash, Cash Equivalents and Restricted Cash $ 21,599 $ 16,283 $ 17,198 $ 509,167