XML 84 R69.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Share-Based Payments - Schedule of Share-Based Payments Issued to BHES (Details) - BHES - Joint Development Agreements - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 07, 2023 | Jun. 30, 2024
Quantity |  |  |
Membership Interests (in shares) | 0 | 9,210 | 0
Total Fair Value |  |  |
Membership Interests | $ 0 | $ 1,943 | $ 0
Stock issued during period, value, issued for services | $ 148 | $ 3,901 | $ 10,526
Membership interests, fair value or equivalent value per unit (in dollars per share) |  |  | $ 168.75
Class A Common Stock |  |  |
Quantity |  |  |
Stock issued during period, shares, issued for services (in shares) | 22,447 | 296,160 | 1,592,425
Total Fair Value |  |  |
Stock issued during period, value, issued for services | $ 148 | $ 1,958 | $ 10,526
Share-based compensation, common stock, fair value or equivalent value per unit (in dollars per share) |  |  | $ 5.29
Class B Common Stock |  |  |
Quantity |  |  |
Stock issued during period, shares, issued for services (in shares) | 22,447 | 296,160 | 1,592,425
Total Fair Value |  |  |
Stock issued during period, value, issued for services | $ 0 | $ 0 | $ 0
Share-based compensation, common stock, fair value or equivalent value per unit (in dollars per share) |  |  | $ 0

X
- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Paid In Kind, Grants in Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
Name: | npwr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPaidInKindGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | npwr_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Issued During Period, In-Kind Shares, New Issues + References No definition available. + Details
Name: | npwr_StockIssuedDuringPeriodInKindSharesNewIssues
Namespace Prefix: | npwr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Issued During Period, In-Kind Shares, New Issues, Value + References No definition available. + Details
Name: | npwr_StockIssuedDuringPeriodInKindSharesNewIssuesValue
Namespace Prefix: | npwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodSharebasedCompensationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders. + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders. + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_CounterpartyNameAxis=npwr_BakerHughesEnergyServicesLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=npwr_JointDevelopmentAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |