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v3.20.4

Stockholders’ equity (Details) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) Vote $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Nov. 12, 2020 USD ($) | Sep. 30, 2019 $ / shares
Common stock |  |  |  |  |
Stock, shares authorized |  | 440,000,000 |  |  |
Common stock, shares authorized |  | 400,000,000 | 400,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001 |  | $ 0.001
Preferred stock, shares authorized |  | 40,000,000 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  |  |
Proceeds from issuance of common stock in initial public offering, net | $ |  |  | $ 86,906,179 |  |
Common stock, shares outstanding |  | 21,186,827 | 21,022,752 |  |
Number of voting rights per common share | Vote |  | 1 |  |  |
Shelf Registration Statement |  |  |  |  |
Maximum amount to be issued under universal shelf registration statement | $ |  |  |  | $ 350,000,000 |
Maximum amount to be issued under at-the-market offering program | $ |  |  |  | $ 50,000,000 |
Amount of equity or debt securities sold under at-the-market offering program | $ |  | $ 0 |  |  |
IPO |  |  |  |  |
Common stock |  |  |  |  |
Number of shares issued | 6,516,667 |  |  |  |
Issue price per share | $ / shares | $ 15.00 |  |  |  |
Proceeds from issuance of common stock in initial public offering, net | $ | $ 86,600,000 |  |  |  |
Underwriters Option |  |  |  |  |
Common stock |  |  |  |  |
Number of shares issued | 850,000 |  |  |  |

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