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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - 9 months ended Sep. 30, 2018 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Series A Redeemable Convertible Preferred Stock
Series B Redeemable Convertible Preferred Stock
Balance (in shares) at Dec. 31, 2017         15,848 39,538
Balance at Dec. 31, 2017         $ 49,935 $ 227,800
Redeemable Convertible Preferred Stock [Roll Forward]            
Accretion of Series A and B redeemable convertible preferred stock         $ 13 $ 421
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)         (15,848) (39,538)
Conversion of redeemable convertible preferred stock to common stock upon initial public offering         $ (49,948) $ (228,221)
Balance (in shares) at Sep. 30, 2018         0 0
Balance at Sep. 30, 2018         $ 0 $ 0
Balance (in shares) at Dec. 31, 2017 24,472 24,472        
Balance at Dec. 31, 2017 $ (371,665) $ 246 $ 20,676 $ (392,587)    
Increase (Decrease) in Stockholders' Deficit [Roll Forward]            
Accretion of Series A and B redeemable convertible preferred stock $ (434)   (434)      
Exercise of stock options (in shares) 654 654        
Exercise of stock options $ 1,415 $ 6 1,409      
Repurchase of common stock (in shares)   (7)        
Repurchase of common stock (75) $ (1) (74)      
Stock-based compensation 14,259   14,259      
Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering expenses (in shares)   12,535        
Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering expenses 264,799 $ 125 264,674      
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)   55,386        
Conversion of redeemable convertible preferred stock to common stock upon initial public offering 278,169 $ 554 277,615      
Net loss $ (53,907)     (53,907)    
Balance (in shares) at Sep. 30, 2018 93,040 93,040        
Balance at Sep. 30, 2018 $ 132,561 $ 930 $ 578,125 $ (446,494)