Fuzhou Note Receivable	6 Months Ended
	Jun. 30, 2021
Receivables [Abstract]
Fuzhou Note Receivable	Fuzhou Note ReceivableIn May 2020, Energy Sales provided a note receivable to Fuzhou Zhengtong Hongxin Investment Management Company Limited (“Zhengtong”) in the amount of 3.0 million RMB ($0.4 million). The note receivable is not collateralized. Zhengtong agreed to repay 3.3 million RMB ($0.5 million) within three months of the disbursement date. The Company has recorded a reserve of $0.5 million against this note receivable, and has commenced legal action in order to recover the amounts due.