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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Transfer of Assets From Level 1 to Level 2 $ 0 $ 0  
Transfer of Assets From Level 2 to Level 1 0 0  
Transfer of Liabilities From Level 1 to Level 2 0 0  
Transfer of Liabilities From Level 2 to Level 1 0 0  
Transfer of Assets Into Level 3 0 0  
Transfer of Assets Out of Level 3 0 0  
Transfer of Liabilities Into Level 3 0 0  
Transfer of Liabilities Out of Level 3 0 $ 0  
Money market funds      
Cash equivalents 94,461   $ 92,914
Quoted Prices in active markets (Level 1) | Money market funds      
Cash equivalents $ 94,461   $ 92,914