Accrued expenses and other current liabilities - Schedule of warranty accruals (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Accrued Expenses and Other Current Liabilities Abstract
Balance at beginning of period	$ 9,346	$ 6,811
Warranties issued during the period	516	1,554
Settlements made during the period	(421)	(1,819)
Changes in liability for pre-existing warranties	(205)	(187)
Balance at end of period	9,236	6,359
Accrued warranty balance reported in:
Other current liabilities	3,771	2,891	$ 4,032
Other non-current liabilities	5,465	3,468
Balance at end of period	$ 9,236	$ 6,359	$ 9,346