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v3.21.1

Stockholder's equity (deficit) - Common stock (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 10, 2020 USD ($) $ / shares shares | Jun. 24, 2019 USD ($) $ / shares shares | Mar. 31, 2021 Vote $ / shares shares | Dec. 31, 2020 $ / shares shares | Jun. 18, 2019 shares
Class of Stock |  |  |  |  |
Common stock, shares authorized |  |  | 150,000,000 | 150,000,000 |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.0001 | $ 0.0001 |
Number of votes per share | Vote |  |  | 1 |  |
Cash dividend declared | $ / shares |  |  | $ 0 |  |
Common stock, shares issued |  |  | 34,770,319 | 34,741,649 |
Common stock, shares outstanding |  |  | 34,770,319 | 34,741,649 |
Common stock were reserved for issuance |  |  |  |  |
Options available for future grant |  |  | 8,113,230 | 6,404,819 |
Options to purchase common stock |  |  |  |  |
Common stock were reserved for issuance |  |  |  |  |
Options available for future grant |  |  | 3,344,146 | 2,127,544 |
2018 Stock option and grant plan |  |  |  |  |
Common stock were reserved for issuance |  |  |  |  |
Options available for future grant |  |  | 2,119,349 | 2,148,019 | 107,635
2019 Stock Option and Incentive plan |  |  |  |  |
Common stock were reserved for issuance |  |  |  |  |
Options available for future grant |  |  | 1,758,356 | 1,585,293 |
2019 Employee Stock Purchase Plan |  |  |  |  |
Common stock were reserved for issuance |  |  |  |  |
Options available for future grant |  |  | 891,379 | 543,963 |
IPO |  |  |  |  |
Class of Stock |  |  |  |  |
Number of shares issued |  | 6,612,500 |  |  |
Public offering price | $ / shares |  | $ 16.00 |  |  |
Proceeds received, net of underwriting discounts and commissions | $ |  | $ 98,394 |  |  |
Offering costs | $ |  | $ 2,942 |  |  |
Number of shares converted |  | 21,056,136 |  |  |
Follow Up Public Offering |  |  |  |  |
Class of Stock |  |  |  |  |
Number of shares issued | 6,012,390 |  |  |  |
Public offering price | $ / shares | $ 36.00 |  |  |  |
Proceeds received, net of underwriting discounts and commissions | $ | $ 203,460 |  |  |  |
Offering costs | $ | $ 906 |  |  |  |
Over allotment | Maximum |  |  |  |  |
Class of Stock |  |  |  |  |
Number of shares issued | 784,224 | 862,500 |  |  |

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