Stock-based compensation - Restricted Stock - (Details) - Unvested restricted common stock units $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) $ / shares shares
Shares
Balance, beginning (in shares) | shares	1,112,563
Granted (in shares) | shares	684,950
Vested (in shares) | shares	(437,245)
Forfeited (in shares) | shares	(46,768)
Balance, ending (in shares) | shares	1,313,500
Weighted Average Grant Date Fair Value Per Share
Balance, beginning (in dollars per share) | $ / shares	$ 5.27
Granted (in dollars per share) | $ / shares	7.28
Vested (in dollars per share) | $ / shares	5.62
Forfeited (in dollars per share) | $ / shares	4.43
Balance, ending (in dollars per share) | $ / shares	$ 6.23
Restricted stock disclosures
Vesting period	3 years
Unrecognized stock-based compensation expense | $	$ 6.4
Remaining weighted-average remaining vesting period	2 years 4 months 24 days