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Inventory - Schedule of Inventory Allowance (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Inventory Valuation Reserves [Roll Forward] |  |
Beginning balance | $ 5,867 | $ 4,004
Allowance for obsolescence | 61 | 1,863
Write-offs | (3,409) | 0
Ending balance | $ 2,519 | $ 5,867

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- Definition Inventory Allowance, Allowance For Obsolescence + References No definition available. + Details
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Namespace Prefix: | ngs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Inventory Valuation Reserves + References No definition available. + Details
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Balance Type: | na
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- Definition Inventory Write-Offs + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of valuation reserve for inventory. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 330 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.BB) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480581/330-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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