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Common Stock (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Oct. 09, 2018
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
May 31, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
shares
Class of Stock [Line Items]              
Dividends | $         $ 0.0 $ 0.0  
Common stock, shares reserved for future issuance (in shares)         11,344,620 8,407,162  
Stock split, conversion ratio       0.7378      
Issuance of common stock upon follow-on offering, net of offering costs (in shares)   4,312,500 5,175,000        
Share price of stock issued (in usd per share) | $ / shares   $ 84.00 $ 71.00        
Issuance of common stock upon follow-on offering, net of offering costs | $   $ 354.6 $ 349.7        
Common stock warrants              
Class of Stock [Line Items]              
Issuance of convertible preferred stock, net of issuance costs (in shares) 7,636            
Shares underlying outstanding stock options              
Class of Stock [Line Items]              
Common stock, shares reserved for future issuance (in shares)         3,101,181 4,494,889  
Shares underlying unvested restricted stock units              
Class of Stock [Line Items]              
Common stock, shares reserved for future issuance (in shares)         1,118,655 496,131  
Market-based restricted stock units              
Class of Stock [Line Items]              
Common stock, shares reserved for future issuance (in shares)         3,391,148 0  
Performance-based restricted stock units              
Class of Stock [Line Items]              
Common stock, shares reserved for future issuance (in shares)         377,922 0  
Shares available for issuance under the 2018 Incentive Award Plan              
Class of Stock [Line Items]              
Common stock, shares reserved for future issuance (in shares)         1,819,223 2,726,225  
Shares available for issuance under the 2018 Employee Stock Purchase Plan              
Class of Stock [Line Items]              
Common stock, shares reserved for future issuance (in shares)         1,536,491 689,917  
Common stock warrants              
Class of Stock [Line Items]              
Issuance of convertible preferred stock, net of issuance costs (in shares) 58,264,577       4,312,500 5,175,000 14,375,000
IPO              
Class of Stock [Line Items]              
Sale of stock, number of shares issued in transaction (in shares) 14,375,000            
Sale of stock, price (in usd per share) | $ / shares $ 19.00            
Proceeds from initial public offering and follow on offering | $ $ 249.5