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Common Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 23, 2019 | Oct. 31, 2019 | May 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 31, 2019
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock, authorized shares |  |  |  | 150,000,000 | 21,147,115 | 29,000,000
Common stock, issued shares |  |  |  | 24,034,022 | 3,848,320 |
Common stock, outstanding shares |  |  |  | 24,034,022 | 3,848,320 |
Common stock shares modified |  |  | 2,904,000 |  |  |
Fair value of common stock shares modified |  |  | $ 0.74 |  |  |
Total compensation cost of common stock shares modified |  |  | $ 2,126 |  |  |
Unrecognized compensation cost, period for recognition |  |  |  | 2 years 2 months 12 days |  |
Compensation cost recognized |  |  |  | $ 2,300 | $ 606 |
Common stock, dividends declared |  |  |  | $ 0 |  |
Convertible preferred stock convert into non-voting common stock |  | 6,409,519 |  |  |  |
Unrecognized compensation cost related to unvested stock-based awards |  |  |  | $ 6,797 |  |
2019 Plan |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Shares reserved for issuance | 2,342,288 |  |  |  |  |
Increase in share reserved percentage | 4.00% |  |  |  |  |
2019 ESPP |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Shares reserved for issuance | 234,229 |  |  |  |  |
Minimum | 2019 ESPP |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Shares reserved for issuance | 234,229 |  |  |  |  |
Increase in share reserved percentage | 1.00% |  |  |  |  |
Stock Options | 2018 Plan |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Number of options granted |  |  |  | 1,959,411 |  |
Stock Options | 2018 and 2019 Plan |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Number of options granted |  |  |  | 1,340,839 | 971,353 |
Weighted average grant-date fair value of stock options granted |  |  |  | $ 5.24 | $ 1.91 |
Aggregate grant-date fair value of options vested |  |  |  | $ 753 | $ 26 |
Stock Options | Minimum | 2018 Plan |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Percentage of exercise price per share of fair market value |  |  |  | 100.00% |  |
Share-based compensation, vesting period |  |  |  | 3 years |  |
Stock Options | Maximum | 2018 Plan |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Term of stock options after grant date |  |  |  | 10 years |  |
Share-based compensation, vesting period |  |  |  | 4 years |  |
Performance-Based Shares |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to unvested stock-based awards, other than options |  |  |  | $ 176 |  |
Research and Development |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Compensation cost recognized |  |  |  | 1,304 | 455 |
General and Administrative Expense |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Compensation cost recognized |  |  |  | $ 996 | 151 |
Founders |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Unrecognized compensation cost, period for recognition |  |  | 3 years | 1 year 3 months 18 days |  |
Unrecognized compensation cost related to unvested stock-based awards |  |  |  | $ 912 |  |
Founders | Research and Development |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Compensation cost recognized |  |  |  | 529 | 399 |
Founders | General and Administrative Expense |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Compensation cost recognized |  |  |  | $ 177 | $ 118 |
Voting Common Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock, authorized shares |  | 143,590,481 |  | 143,590,481 | 21,147,115 |
Common stock, issued shares |  |  |  | 17,624,503 | 3,848,320 |
Common stock, outstanding shares |  |  |  | 17,624,503 | 3,848,320 |
Non-voting Common Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock, authorized shares |  | 6,409,519 |  | 6,409,519 |  |
Common stock, issued shares |  |  |  | 6,409,519 |  |
Common stock, outstanding shares |  |  |  | 6,409,519 |  |

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