Accounts Receivable - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Changes in the allowance for doubtful accounts	$ 348	$ 350	$ 1,219
Accounts receivable	346	1,607	$ 1,219	$ 0
Guizhou Qianxi Green Environmentally Friendly Taxi Service Co
Accounts, Notes, Loans and Financing Receivable [Line Items]
Taxi commission revenue receivables	0	1,300
Changes in the allowance for doubtful accounts	$ 300
Accounts receivable		$ 400