Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

COMMITMENTS AND CONTINGENCIES - Line of Credit Facility (Details) - Line of credit - HSBC China $ in Millions	1 Months Ended
	Dec. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)
Commitments and Contingencies
Maximum borrowing capacity	$ 9.0		$ 15.0
Accounts payable
Commitments and Contingencies
Amount outstanding		$ 10.6
People's Bank of China
Commitments and Contingencies
Multiplier for calculating effective rate from benchmark rate	1.10