SIGNIFICANT ACCOUNTING POLICIES (cash and cash equivalents and trade accounts receivable) (Details)	12 Months Ended
Dec. 31, 2019
Cash and cash equivalents
Maximum maturity of cash equivalents	3 months
Trade accounts receivable
Period for write-off of trade accounts receivable	1 year

Threshold period past due for trade accounts receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_ThresholdPeriodPastDueForWriteoffOfTradeAccountsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration