Stock-based compensation - Restricted Stock - (Details) - Unvested restricted common stock units $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Shares
Balance, beginning (in shares) | shares	1,112,563
Granted (in shares) | shares	999,250
Vested (in shares) | shares	(531,560)
Forfeited (in shares) | shares	(209,356)
Balance, ending (in shares) | shares	1,370,897
Weighted Average Grant Date Fair Value Per Share
Balance, beginning (in dollars per share) | $ / shares	$ 5.27
Granted (in dollars per share) | $ / shares	7.58
Vested (in dollars per share) | $ / shares	5.73
Forfeited (in dollars per share) | $ / shares	6.08
Balance, ending (in dollars per share) | $ / shares	$ 6.65
Restricted stock disclosures
Vesting period	3 years
Unrecognized stock-based compensation expense | $	$ 6.8
Remaining weighted-average remaining vesting period	1 year 1 month 6 days