INVENTORIES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
INVENTORIES [Abstract]
Return reserve	$ 508	$ 473	$ 694

Amount of estimated sales returns.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration