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Subsequent events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | Jan. 04, 2022 | Dec. 31, 2021 | Sep. 12, 2021 | Dec. 31, 2020 | Sep. 13, 2020
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Subsequent events |  |  |  |  |
Common stock shares issued |  |  | 3,623,189 |  |
Common stock, par value (in dollars per share) |  | $ 0.001 | $ 0.001 | $ 0.001 |
Purchase price (in dollars per share) |  |  | $ 2.76 |  |
Common Stock |  |  |  |  |
Subsequent events |  |  |  |  |
Common stock shares issued |  |  |  |  | 1,058,025
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.001
Purchase price (in dollars per share) |  |  |  |  | $ 2.4925
Subsequent Event | Edward D. Bagley | Bridge Loan |  |  |  |  |
Subsequent events |  |  |  |  |
Principal amount of loan obtained | $ 2,000,000 |  |  |  |
Bridge loan issuance date | Jul. 02, 2021 |  |  |  |
Subsequent Event | Securities Purchase Agreement | Edward D. Bagley | Private Placement | Common Stock |  |  |  |  |
Subsequent events |  |  |  |  |
Common stock shares issued | 1,538,461 |  |  |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |  |  |
Purchase price (in dollars per share) | $ 1.3 |  |  |  |

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