Accounts Receivable - Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Taxi commission revenue receivables	$ 1,200,000	$ 1,300,000
Changes in the allowance for doubtful accounts	0	350,000
Accounts receivable	1,535,000	1,607,000	$ 1,219,000
Guizhou Qianxi Green Environmentally Friendly Taxi Service Co
Accounts, Notes, Loans and Financing Receivable [Line Items]
Changes in the allowance for doubtful accounts	$ 0
Accounts receivable		$ 400,000