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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
Dec. 31, 2016
Dec. 31, 2015
Fair Value    
Total assets measured at fair value $ 29,869 $ 2,354
Redeemable convertible preferred stock warrant liability   437
Total liabilities measured at fair value   437
Level 1    
Fair Value    
Total assets measured at fair value 29,869 2,354
Level 3    
Fair Value    
Redeemable convertible preferred stock warrant liability   437
Total liabilities measured at fair value   437
Money Market Funds    
Fair Value    
Money market funds 29,869 2,354
Money Market Funds | Level 1    
Fair Value    
Money market funds $ 29,869 $ 2,354