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Inventories - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Chemistry Technologies |  |  |  |
Inventory |  |  |  |
Provision for excess and obsolete inventory | $ 28 | $ 200 | $ 300 | $ 600
Data Analytics |  |  |  |
Inventory |  |  |  |
Provision for excess and obsolete inventory | $ 28 | $ 0 | $ 45 | $ 13

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- Definition Inventory Valuation Provision + References No definition available. + Details
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Namespace Prefix: | ftk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ftk_ChemistryTechnologiesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ftk_DataAnalyticsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |