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SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Revenue from External Customer [Line Items] |  |  |  |
Revenue | $ 350,044 | $ 332,690 | $ 1,046,185 | $ 981,928
Imaging Center Segment Revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 349,144 | 332,194 | 1,043,129 | 981,432
Commercial insurance |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 189,634 | 185,723 | 573,259 | 555,355
Medicare |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 78,034 | 73,163 | 226,827 | 207,977
Medicaid |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 9,669 | 8,707 | 28,456 | 26,198
Workers' compensation/personal injury |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 13,200 | 11,554 | 38,785 | 32,507
Other patient revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 7,646 | 4,800 | 22,334 | 14,766
Management fee revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 6,099 | 5,255 | 17,199 | 16,007
Software revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 3,430 | 2,068 | 9,849 | 7,115
Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 3,431 | 3,641 | 12,054 | 10,058
Revenue under capitation arrangements |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 38,001 | 37,283 | 114,366 | 111,449
AI Segment Revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | $ 900 | $ 496 | $ 3,056 | $ 496

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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