Stock based compensation - Restricted stock (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2022	Dec. 31, 2021
Shares
Total Unvested	681,789
Vested	(434,009)
Total Unvested	247,780
Weighted Average Exercise Price
Total Unvested	$ 4.20
Vested	1.80
Total Unvested	$ 8.41
Restricted stock vesting period	4 years
Deposit liability	$ 860	$ 980
Restricted stock
Shares
Vested	(2,203,028)
Weighted Average Exercise Price
Restricted stock vesting period	4 years
Unvested restricted stock with time-based vesting
Weighted Average Exercise Price
Unrecognized compensation expense	$ 2,063
Unrecognized compensation expense expected to be recognized over a weighted average period	1 year 4 months 17 days
Deposit liability	$ 1,831

The current portion, due within one year or one operating cycle, if longer, of deposits held other than customer deposits.

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