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Cash, Cash Equivalents, Marketable Securities and Restricted Cash - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash, Cash Equivalents, and Short-term Investments [Abstract]        
Cash and cash equivalents $ 79,749 $ 49,060 $ 187,026  
Restricted cash 2,626 2,177 387  
Cash and cash equivalents and restricted cash shown in the statement of cash flows $ 82,375 $ 51,237 $ 187,413 $ 69,485