Intangible assets, net and goodwill - Intangible Assets Acquired through Business Combination (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 15,100,000	$ 15,100,000
Accumulated Amortization	(2,569,000)	(1,503,000)
Intangible Assets, Net	$ 12,531,000	$ 13,597,000	$ 0
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	6 years	6 years
Intangible Assets, Gross	$ 5,500,000	$ 5,500,000
Accumulated Amortization	(552,000)	(323,000)
Intangible Assets, Net	$ 4,948,000	$ 5,177,000
Vendor relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	3 years	3 years
Intangible Assets, Gross	$ 4,500,000	$ 4,500,000
Accumulated Amortization	(903,000)	(529,000)
Intangible Assets, Net	$ 3,597,000	$ 3,971,000
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	3 years	3 years
Intangible Assets, Gross	$ 4,200,000	$ 4,200,000
Accumulated Amortization	(843,000)	(493,000)
Intangible Assets, Net	$ 3,357,000	$ 3,707,000
Tradename
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	2 years	2 years
Intangible Assets, Gross	$ 900,000	$ 900,000
Accumulated Amortization	(271,000)	(158,000)
Intangible Assets, Net	$ 629,000	$ 742,000