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Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Cash, Cash Equivalents, and Restricted Cash [Abstract]        
Cash and cash equivalents $ 45,916 $ 29,913    
Restricted cash-short-term included in other current assets 294 518    
Restricted cash-long-term 997 1,496    
Total cash, cash equivalents, and restricted cash $ 47,207 $ 31,927 $ 31,087 $ 47,052