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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
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