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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Redeemable Convertible Preferred Stock [Member]
Series B Preferred Stock [Member]
Series C Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2013   $ 9,122            
Balance, Shares at Dec. 31, 2013   24,037,500            
Issuance of Series B redeemable convertible preferred stock     $ 9,000          
Issuance of Series B redeemable convertible preferred stock, Shares     18,000,000          
Settlement of fair value of redeemable convertible preferred stock tranche liability     $ 2,308          
Accretion of redemption of convertible preferred stock to redemption value $ 146 $ 146            
Balance at Dec. 31, 2014   $ 20,576            
Balance, Shares at Dec. 31, 2014   42,037,500            
Balance at Dec. 31, 2013 (1,394)         $ 135 $ (46) $ (1,483)
Balance, Shares at Dec. 31, 2013         226,009      
Accretion of redeemable convertible preferred stock to redemption value (146)         (143)   (3)
Stock-based compensation expense 42         42    
Issuance of common stock upon the exercise of options 3         3    
Issuance of common stock upon the exercise of options, Shares         2,548      
Other comprehensive loss (54)           (54)  
Net loss (11,072)             (11,072)
Balance at Dec. 31, 2014 (12,621)         37 (100) (12,558)
Balance, Shares at Dec. 31, 2014         228,557      
Issuance of Series B redeemable convertible preferred stock       $ 16,345        
Issuance of Series B redeemable convertible preferred stock, Shares       35,147,617        
Accretion of redemption of convertible preferred stock to redemption value 75 $ 75            
Balance at Dec. 31, 2015 $ 36,996 $ 36,996            
Balance, Shares at Dec. 31, 2015 77,185,117 77,185,117            
Accretion of redeemable convertible preferred stock to redemption value $ (75)         (75)    
Stock-based compensation expense 99         99    
Issuance of common stock upon the exercise of options 57         57    
Issuance of common stock upon the exercise of options, Shares         43,852      
Other comprehensive loss (2)           (2)  
Net loss (14,858)             (14,858)
Balance at Dec. 31, 2015 $ (27,400)         118 (102) (27,416)
Balance, Shares at Dec. 31, 2015 272,409       272,409      
Exercise of redeemable convertible preferred stock warrant liability   $ 1,025            
Exercise of redeemable convertible preferred stock warrant liability, Shares   1,999,998            
Issuance of Series B redeemable convertible preferred stock       $ 22,488        
Issuance of Series B redeemable convertible preferred stock, Shares       45,189,794        
Settlement of fair value of redeemable convertible preferred stock tranche liability $ 5,837              
Accretion of redemption of convertible preferred stock to redemption value $ 558 $ 558            
Balance, Shares at Dec. 31, 2016 0              
Accretion of redeemable convertible preferred stock to redemption value $ (558)         (558)    
Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering 66,904 $ (66,904)       66,904    
Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering, Shares   (124,374,909)     8,577,571      
Issuance of common stock upon initial public offering, net of issuance costs 83,648         83,648    
Issuance of common stock upon initial public offering, net of issuance costs, Shares         7,752,972      
Stock-based compensation expense 2,130         2,130    
Issuance of common stock upon the exercise of options 151         151    
Issuance of common stock upon the exercise of options, Shares         119,328      
Other comprehensive loss (143)           (143)  
Net loss (37,177)             (37,177)
Balance at Dec. 31, 2016 $ 87,555         $ 152,393 $ (245) $ (64,593)
Balance, Shares at Dec. 31, 2016 16,722,280       16,722,280