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Organization - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
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Jul. 10, 2020 USD ($) $ / shares shares | Oct. 10, 2019 USD ($) $ / shares shares | Sep. 16, 2019 | Sep. 30, 2020 USD ($) shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2019 USD ($) | Oct. 11, 2019 shares | Jun. 30, 2019 shares | Dec. 31, 2018 shares | Sep. 30, 2016 shares
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, conversion ratio |  |  | 0.222222222 |  |  |  |  |  |  |  |
Reverse stock split, description |  |  |  |  | On September 16, 2019, the Company’s board of directors approved an amendment to the Company’s amended and restated certificate of incorporation to effect a 1-for-4.5 reverse split (“Reverse Split”) of shares of the Company’s common and convertible preferred stock, which was effected on September 27, 2019. |  |  |  |  |  |
Net proceeds after deducting underwriting discounts, commissions and offering expenses |  | $ 126,400 |  |  |  |  |  |  |  |  |
Gross proceeds from the offering |  |  |  | $ 323,214 | $ 323,214 |  |  |  |  |  |
Offering expenses |  |  |  |  |  | $ 3,686 |  |  |  |  |
Accumulated deficit |  |  |  | 561,535 | 561,535 |  | $ 368,519 |  |  |  |
Cash, cash equivalents and short-term investments |  |  |  | $ 826,600 | $ 826,600 |  |  |  |  |  |
Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding convertible preferred stock (in shares) | shares |  |  |  |  |  | 88,112,733 |  |  | 88,112,733 | 69,910,520 |
Series A-1 Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrant to purchase of convertible preferred stock | shares |  |  |  |  |  |  |  |  |  |  | 244,444
Common Stock |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, shares | shares |  |  |  | 8,214,285 | 8,214,285 |  |  |  |  |  |
Warrant to purchase of convertible preferred stock | shares |  | 244,444 |  |  |  |  |  |  |  |  |
Gross proceeds from the offering |  |  |  | $ 1 | $ 1 |  |  |  |  |  |
IPO |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, shares | shares |  | 7,142,858 |  |  |  |  |  |  |  |  |
Common stock price per share | $ / shares |  | $ 20.00 |  |  |  |  |  |  |  |  |
Outstanding convertible preferred stock (in shares) | shares |  | 88,112,733 |  |  |  |  |  | 0 |  |  |
IPO | Common Stock | Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of convertible preferred stock converted to shares of common stock (in shares) | shares |  | 88,112,733 |  |  |  |  |  |  |  |  |
IPO | Common Stock | Warrant to Purchase Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of convertible preferred stock converted to shares of common stock (in shares) | shares |  | 244,444 |  |  |  |  |  |  |  |  |
Follow-on Offering | Common Stock |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, shares | shares | 8,214,285 |  |  |  |  |  |  |  |  |  |
Common stock price per share | $ / shares | $ 42.00 |  |  |  |  |  |  |  |  |  |
Gross proceeds from the offering | $ 345,000 |  |  |  |  |  |  |  |  |  |
Payments of underwriting discounts and commissions | 20,700 |  |  |  |  |  |  |  |  |  |
Offering expenses | 1,100 |  |  |  |  |  |  |  |  |  |
Net proceeds after deducting underwriting discounts, commissions and offering expenses | $ 323,200 |  |  |  |  |  |  |  |  |  |

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