SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Memberships (Details) - Members $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($) customer	Dec. 31, 2014 USD ($) customer
Memberships
Number of Members \| customer	44	44
Membership fee per member \| $	$ 5	$ 5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration