Income taxes - Schedule of deferred tax assets and liability (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Accrued compensation	$ 818	$ 545
Allowance for bad debt	74	105
State tax accrual	13	13
Stock-based compensation	1,328	2,595
Net operating loss	755	2,364
Credits	195	71
Total deferred tax assets	3,183	5,693
Deferred tax liabilities
Fixed asset basis	(153)	(84)
Intangible assets	(4,599)	(2,093)
Other foreign DTLs	(24)	0
Total deferred tax liabilities	(4,776)	(2,177)
Net deferred taxes	$ (1,593)
Net deferred taxes		$ 3,516