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Fair Value Measurements - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Assets measured at fair value     $ 0
Liabilities measured at fair value   $ 0  
Series 2 Redeemable Convertible Preferred Stock      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Stock fair market value $ 17.50   $ 19.20
Stock exercise price $ 9.318 $ 9.318  
Volatility rate 50.00% 50.00%  
Series 2 Redeemable Convertible Preferred Stock | Minimum      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Remaining contractual life of warrants 1 year 1 year  
Risk-free interest rate 0.50% 0.60%  
Series 2 Redeemable Convertible Preferred Stock | Maximum      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Remaining contractual life of warrants 6 years 7 years  
Risk-free interest rate 1.30% 2.10%