Stock-based compensation - Restricted Stock - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Restricted stock disclosures
Stock-based compensation.	$ 4,042	$ 2,672	$ 7,615	$ 5,230
Unvested restricted common stock units
Shares
Balance, beginning (in shares)			1,370,897
Granted (in shares)			851,908
Vested (in shares)			(381,069)
Forfeited (in shares)			(38,196)
Balance, ending (in shares)	1,803,540		1,803,540
Weighted Average Grant Date Fair Value Per Share
Balance, beginning (in dollars per share)			$ 6.65
Granted (in dollars per share)			8.16
Vested (in dollars per share)			6.06
Forfeited (in dollars per share)			6.51
Balance, ending (in dollars per share)	$ 7.49		$ 7.49
Restricted stock disclosures
Vesting period			3 years
Stock-based compensation.	$ 1,382	$ 724	$ 2,471	$ 1,565
Unrecognized stock-based compensation expense	$ 11,100		$ 11,100
Remaining weighted-average remaining vesting period			2 years 3 months 18 days