BORROWINGS (Schedule of Future Principal Repayment on the Long-Term Bank Loans) (Details)	Dec. 31, 2016 USD ($)
Future principal repayment on the long-term bank loans
2020 and after	$ 28,835,700

Represents the amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year and thereafter following the latest fiscal year.

No definition available.

Name:	sol_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFourAndThereafter
Namespace Prefix:	sol_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant