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Fair Value Measurement and Financial Instruments - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Carrying Amount | Convertible preferred sock warrant liability    
Liabilities    
Total liabilities   $ 478
Fair Value | Convertible preferred sock warrant liability    
Liabilities    
Total liabilities   478
Money market funds | Carrying Amount    
Assets    
Total assets $ 86,605 11,149
Money market funds | Fair Value    
Assets    
Total assets 86,605 11,149
Quoted Prices In Active Markets (Level 1) | Money market funds    
Assets    
Total assets $ 86,605 11,149
Significant Unobservable Inputs (Level 3) | Convertible preferred sock warrant liability    
Liabilities    
Total liabilities   $ 478