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REVENUE RECOGNITION - Schedule of customer trade receivables and customer deposit liability (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Receivables |  |
Revenue Recognition, Customer Deposits [Roll Forward] |  |
Opening balance | $ 7,713 | $ 4,455
Closing balance | 10,283 | 3,609
Increase (decrease) | 2,570 | (846)
Customer Deposit Liability |  |
Revenue Recognition, Customer Deposits [Roll Forward] |  |
Opening balance | 5,155 | 2,504
Closing balance | 6,793 | 2,335
Increase (decrease) | $ 1,638 | $ (169)

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- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 310 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123371682&loc=d3e55415-109406 + Details
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