Net income (loss) per share - Basic and diluted weighted average shares outstanding (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income (loss)	$ 17,624	$ (25,137)	$ (22,782)	$ (76,906)
Denominator for basic net income (loss) per share:
Weighted average shares outstanding-basic	38,507,542	37,780,547	38,292,497	37,623,309
Denominator for diluted net income (loss) per share:
Weighted average shares outstanding-basic	38,507,542	37,780,547	38,292,497	37,623,309
Common stock options and restricted stock units	1,062,852
Weighted average shares outstanding-diluted	39,570,394	37,780,547	38,292,497	37,623,309