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INTANGIBLE ASSETS - Weighted average remaining useful life (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Loss on impairment of long-lived assets | $ 0 | $ 0
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average remaining amortization period (in years) | 2 years 2 months 12 days |
Capitalized software development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average remaining amortization period (in years) | 2 years 3 months 18 days |
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average remaining amortization period (in years) | 2 years |

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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 + Details
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