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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) segment | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
Concentration Risk [Line Items] |  |  |
Number of segments | segment | 1 |  |
Revenue from sales-type leases | $ 0 |  |
Deferred revenue | $ 21,000 |  | $ 18,000
Maximum [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue from sales-type leases |  | $ 100,000 |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 Reference 3: 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 + Details
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