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Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Cash, Cash Equivalents, and Restricted Cash [Abstract]        
Cash and cash equivalents $ 33,390 $ 31,242    
Restricted cash-short-term 7,876 6,792    
Restricted cash-long-term 493 520    
Total cash, cash equivalents, and restricted cash $ 41,759 $ 38,554 $ 39,873 $ 44,197