Stock-based compensation - Restricted Stock - (Details) - Unvested restricted common stock units $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Shares
Balance, beginning (in shares) | shares	1,112,563
Granted (in shares) | shares	725,550
Vested (in shares) | shares	(459,745)
Forfeited (in shares) | shares	(65,641)
Balance, ending (in shares) | shares	1,312,727
Weighted Average Grant Date Fair Value Per Share
Balance, beginning (in dollars per share) | $ / shares	$ 5.27
Granted (in dollars per share) | $ / shares	7.52
Vested (in dollars per share) | $ / shares	5.68
Forfeited (in dollars per share) | $ / shares	4.65
Balance, ending (in dollars per share) | $ / shares	$ 6.40
Restricted stock disclosures
Vesting period	3 years
Unrecognized stock-based compensation expense | $	$ 6.0
Remaining weighted-average remaining vesting period	2 years 3 months 18 days