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Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value    
Total assets measured at fair value $ 32,856 $ 13,369
Level 1    
Fair Value    
Total assets measured at fair value 32,856 13,369
Money Market Funds    
Fair Value    
Money market funds 32,856 13,369
Money Market Funds | Level 1    
Fair Value    
Money market funds $ 32,856 $ 13,369