GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying amount of goodwill (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2020
GOODWILL AND OTHER INTANGIBLE ASSETS
Balance, beginning		$ 4,726,000	$ 4,726,000
Currency translation adjustment			7,000
Impairment of goodwill	$ (1,328,000)	$ (284,000)
Balance, ending			$ 4,449,000

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration