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Summary of significant accounting policies - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended	9 Months Ended
	May 17, 2022	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Aug. 14, 2022	May 13, 2022	Dec. 31, 2021
Unusual or Infrequent Item, or Both [Line Items]
Accounts receivable, after allowance for credit loss		$ 2,000				$ 2,000
Utilization warrant (percent)		50.00%				50.00%			50.00%
Contract asset, current		$ 15,300				$ 15,300				$ 4,300
Contract asset, non-current		22,200				22,200				18,400
Contract with customer, asset, allowance for credit loss, write off		500	$ 0			800	$ 0
Deferred costs to obtain and fulfill contracts		12,800				12,800				$ 13,800
Amortization of deferred costs		1,400	600			3,000	1,300
Impairment charges recognized		900				1,400
Cumulative catch-up revenue recognized				$ 2,200	$ 2,200
Advertising expense		2,500	3,000			15,000	10,600
Rebates From Suppliers
Unusual or Infrequent Item, or Both [Line Items]
Revenue from related parties		1,300	0			5,800	0
Reduction of inventory		200				200
United States
Unusual or Infrequent Item, or Both [Line Items]
Additional revenue recognized				1,300	$ 1,300
Deferred State Contracts
Unusual or Infrequent Item, or Both [Line Items]
Additional revenues recognized				$ 1,700
Franchise
Unusual or Infrequent Item, or Both [Line Items]
Revenue from related parties		$ 2,188	$ 2,724			$ 7,164	$ 3,329
Franchise Renewal Fees
Unusual or Infrequent Item, or Both [Line Items]
Agreement terms						10 years
Minimum \| Franchise
Unusual or Infrequent Item, or Both [Line Items]
Agreement terms						3 years
Maximum \| Franchise
Unusual or Infrequent Item, or Both [Line Items]
Agreement terms						5 years
Immediately Exercisable Warrant
Unusual or Infrequent Item, or Both [Line Items]
Exercise of warrants (in shares)	346,192
Class Of Warrant Or Right, 50% Utilization Warrant
Unusual or Infrequent Item, or Both [Line Items]
Utilization warrant (percent)		50.00%				50.00%		50.00%	50.00%
Customer Concentration Risk \| Accounts receivable \| One Customer
Unusual or Infrequent Item, or Both [Line Items]
Revenue concentration by customer (in percentage)						22.00%
Customer Concentration Risk \| Revenue \| One Customer
Unusual or Infrequent Item, or Both [Line Items]
Revenue concentration by customer (in percentage)		20.00%