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REVENUE RECOGNITION - Schedule of customer trade receivables and customer deposit liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue Recognition, Customer Deposits [Roll Forward] |  |  |
Increase (decrease) | $ 6,362 | $ 2,651 | $ 1,988
Receivables |  |  |
Revenue Recognition, Customer Deposits [Roll Forward] |  |  |
Opening balance | 7,713 | 4,455 |
Closing balance | 8,181 | 7,713 | 4,455
Increase (decrease) | 468 | 3,258 |
Customer Deposit Liability |  |  |
Revenue Recognition, Customer Deposits [Roll Forward] |  |  |
Opening balance | 5,155 | 2,504 |
Closing balance | 11,686 | 5,155 | $ 2,504
Increase (decrease) | $ 6,531 | $ 2,651 |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
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