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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue Recognition [Line Items]
Deferred revenue	$ 34,802,000	$ 38,044,000
Period for which points earned by members are valid	1 year
PRO Access, monthly fee for membership program	$ 39.99
Membership Program
Revenue Recognition [Line Items]
Deferred revenue	24,400,000	$ 24,400,000
Discounts redeemed by customers	$ 1,400,000

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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