Prepaid and other assets - Summary of Prepaid and Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 9,315	$ 10,503
Deposits to vendors	2,111	3,132
Other	1,406	551
Total prepaid and other current assets	12,832	14,186
Prepaid expenses, non-current	2,583	1,308
Deposits to vendors, non-current	1,018	3,346
Indefinite-lived intangible assets	6,692	6,217
Other intangible assets, net	184	428
Investments	1,010	0
Total other assets	$ 11,487	$ 11,299