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REVENUE (Tables) | 3 Months Ended
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Mar. 31, 2023
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | A disaggregation of our revenue from contracts with customers by geographic region, by reportable operating segment and by service type is presented below (in thousands): Geographic area:
|  | Three Months Ended March 31, 2023
|  | (unaudited)
|  | United States and Canada |  | Other Countries |  | Total
Revenue: |  |  |  |  |  |
IHT |  | $ | 98,531 |  |  | $ | 3,298 |  |  | $ | 101,829 |
MS |  | 72,031 |  |  | 28,417 |  |  | 100,448 |
Total |  | $ | 170,562 |  |  | $ | 31,715 |  |  | $ | 202,277 |
|  | Three Months Ended March 31, 2022
|  | (unaudited)
|  | United States and Canada |  | Other Countries |  | Total
Revenue: |  |  |  |  |  |
IHT |  | $ | 93,376 |  |  | $ | 2,219 |  |  | 95,595 |
MS |  | 63,931 |  |  | 29,510 |  |  | 93,441 |
Total |  | $ | 157,307 |  |  | $ | 31,729 |  |  | $ | 189,036 |
Operating segment and service type:
| Three Months Ended March 31, 2023
| (unaudited)
| Non-Destructive Evaluation and Testing Services |  | Repair and Maintenance Services |  | Heat Treating |  | Other |  | Total
Revenue: |  |  |  |  |  |  |  |  |
IHT | $ | 81,606 |  |  | $ | 3 |  |  | $ | 13,728 |  |  | $ | 6,492 |  |  | $ | 101,829 |
MS | — |  |  | 99,838 |  |  | 278 |  |  | 332 |  |  | 100,448 |
Total | $ | 81,606 |  |  | $ | 99,841 |  |  | $ | 14,006 |  |  | $ | 6,824 |  |  | $ | 202,277 |
| Three Months Ended March 31, 2022
| (unaudited)
| Non-Destructive Evaluation and Testing Services |  | Repair and Maintenance Services |  | Heat Treating |  |  |  | Other |  | Total
Revenue: |  |  |  |  |  |  |  |  |  |  |
IHT | $ | 76,449 |  |  | $ | 24 |  |  | $ | 13,839 |  |  |  |  | $ | 5,283 |  |  | $ | 95,595 |
MS | — |  |  | 91,770 |  |  | 57 |  |  |  |  | 1,614 |  |  | 93,441 |
Total | $ | 76,449 |  |  | $ | 91,794 |  |  | $ | 13,896 |  |  |  |  | $ | 6,897 |  |  | $ | 189,036 |
Contract with Customer, Asset and Liability | The following table provides information about trade accounts receivable, and contract assets as of March 31, 2023 and December 31, 2022 (in thousands):
| March 31, 2023 |  | December 31, 2022 |  | Change
| (unaudited) |  |  |  |
Trade accounts receivable, net 1 | $ | 178,211 |  |  | $ | 186,689 |  |  | $ | (8,478) |
Contract assets 2 | $ | 2 |  |  | $ | 2 |  |  | $ | — |
_________________ 1 Includes billed and unbilled amounts, net of allowance for credit losses. See Note 4 - Receivables for details. 2 Included in the “Prepaid expenses and other current assets” line on the condensed consolidated balance sheet.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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