ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details) - Accounting Standards Update 2014-09	Jan. 01, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Cumulative effect of new accounting pronouncement, amount of potential impact not recorded	$ 400,000
Cumulative effect of new accounting principle in period of adoption	$ 0

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

No definition available.

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