Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 4,900		$ 4,900		$ 2,405
Less: allowance for doubtful accounts	(585)		(585)		0
Accounts receivable, net	4,315		4,315		2,405
Changes in the allowance for doubtful accounts	$ 600	$ 0		$ 0
Guizhou Qianxi Green Environmentally Friendly Taxi Service Co
Accounts, Notes, Loans and Financing Receivable [Line Items]
Taxi Commission Revenue Receivables			$ 1,200		$ 2,300