Summary of significant accounting policies and basis of presentation - Net income (loss) per share - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities	8,818,841	7,357,134	5,956,827
Numerator:
Net income (loss)	$ 132,330	$ (46,408)	$ (71,197)
Denominator for basic net income (loss) per share:
Weighted average shares outstanding-basic	43,020,747	38,356,810	37,668,947
Denominator for diluted net income (loss) per share:
Weighted average shares outstanding-basic	43,020,747	38,356,810	37,668,947
Common stock options and restricted stock units	1,548,587
Weighted average shares outstanding-diluted	44,569,334	38,356,810	37,668,947
Financial instruments with off-balance sheet risk	$ 0
Unvested restricted common stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities	22,500	45,000	137,255
Unvested restricted common stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities	1,370,897	1,112,563	806,379
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities	7,425,444	6,199,571	5,013,193