Summary of significant accounting policies - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($) $ / shares shares	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Concentration Risk [Line Items]
Number of operating segments | segment	2
Number of reportable segments | segment	2
Exercise price of warrants (in USD per share) | $ / shares		$ 0.196
Redeemable convertible preferred stock	$ 0	$ 274,267		$ 0	$ 274,104
Operating lease right-of-use assets	15,994
Operating lease liabilities	$ 18,868
Reclassification
Concentration Risk [Line Items]
Redeemable convertible preferred stock warrants outstanding		$ (200)
Series A-1 Preferred Stock
Concentration Risk [Line Items]
Issuance of convertible preferred stock, net of issuance costs (in shares) | shares		12,595
Series A-1 Preferred Stock | Reclassification
Concentration Risk [Line Items]
Redeemable convertible preferred stock		$ 200
Accounting Standards Update 2016-02 | Cumulative Effect, Period of Adoption, Adjustment
Concentration Risk [Line Items]
Operating lease right-of-use assets			$ 17,600
Operating lease liabilities			$ 20,000
Reseller Partner | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%