Intangible assets, net and goodwill - Intangible Assets Acquired through Business Combination (Details) - USD ($)	4 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 15,100,000
Accumulated Amortization	(1,503,000)
Intangible Assets, Net	$ 13,597,000	$ 0
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	6 years
Intangible Assets, Gross	$ 5,500,000
Accumulated Amortization	(323,000)
Intangible Assets, Net	$ 5,177,000
Vendor relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	3 years
Intangible Assets, Gross	$ 4,500,000
Accumulated Amortization	(529,000)
Intangible Assets, Net	$ 3,971,000
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	3 years
Intangible Assets, Gross	$ 4,200,000
Accumulated Amortization	(493,000)
Intangible Assets, Net	$ 3,707,000
Tradename
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	2 years
Intangible Assets, Gross	$ 900,000
Accumulated Amortization	(158,000)
Intangible Assets, Net	$ 742,000