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Common stock and convertible preferred stock - Preferred Stock (Details) | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2020 USD ($) shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) D $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Class of Stock [Line Items] |  |  |  |  |
Gross proceeds |  |  | $ 11,046,000 |  |
Payment of IPO costs |  |  | $ 27,000 |  |
Series A Preferred Convertible Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares issued | shares | 4,722 | 388,888 | 1,226,925 | 1,226,925 | 512,826
Issue price per share | $ / shares |  | $ 9.00 |  | $ 9.00 | $ 9.00
Gross proceeds | $ 45,000 | $ 3,500,000 |  | $ 11,000,000.0 | $ 4,600,000
Payment of IPO costs |  |  |  |  | $ 35,000
Shares issued for conversion of debt | shares |  | 5,670,184 |  |  | 821,657
Amount of debt converted |  |  |  |  | $ 6,800,000
Shares purchased by issuing warrants | shares |  |  | 1,035,196 |  |
Net proceeds from Series A Preferred shares |  |  | $ 9,500,000 |  |
Exercise price | $ / shares |  |  | $ 9.00 |  |
Warrants rights term |  |  | 3 years |  |
Stock price | $ / shares |  |  | $ 27.00 |  |
Number of trading days | D |  |  | 10 |  |
Number of consecutive trading days | D |  |  | 20 |  |
Fair value |  |  | $ 1,500,000 |  |

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