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Common stock - Public Offering of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | Sep. 24, 2021 | Jun. 22, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Feb. 05, 2019
--- | --- | --- | --- | --- | ---
Common stock, par value (in dollars per share) |  |  | $ 0.001 | $ 0.001 |
2019 Warrants |  |  |  |  |
Warrant to purchase shares of common stock |  |  |  |  | 7,557,142
Exercise price of warrant |  |  | 1.95 |  | $ 1.95
June 2020 |  |  |  |  |
Warrant to purchase shares of common stock |  | 2,250,000 |  |  |
Exercise price of warrant |  | $ 0.001 | 0.001 |  |
September 2021 |  |  |  |  |
Common stock issued | 8,771,928 |  |  |  |
Issue price | $ 2.85 |  |  |  |
Warrant to purchase shares of common stock | 8,771,928 |  |  |  |
Exercise price of warrant | $ 0.001 |  | $ 0.001 |  |
Common Stock. | September 2021 |  |  |  |  |
Common stock issued | 22,828,072 |  |  |  |
Issue price | $ 2.85 |  |  |  |
Net proceeds from issuance of common stock | $ 96,828 |  |  |  |
Underwriters' exercise | Common Stock. | September 2021 |  |  |  |  |
Common stock issued | 4,740,000 |  |  |  |
Common Stock. | June 2020 |  |  |  |  |
Common stock issued |  | 20,250,000 |  |  |
Issue price |  | $ 2.00 |  |  |
Net proceeds from issuance of common stock |  | $ 48,276 |  |  |
Common Stock. | September 2021 |  |  |  |  |
Common stock issued | 27,568,072 |  |  |  |
Issue price | $ 0.001 |  |  |  |
Common Stock. | Underwriters' exercise | June 2020 |  |  |  |  |
Common stock issued |  | 3,375,000 |  |  |

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