| Label | Element | Value |
|---|---|---|
| Other Comprehensive Income (Loss), Net of Tax | us-gaap_OtherComprehensiveIncomeLossNetOfTax | $ (8,000) |
| Other Comprehensive Income (Loss), Net of Tax | us-gaap_OtherComprehensiveIncomeLossNetOfTax | 31,000 |
| Issuance of Class B common stock | gnln_StockIssuedDuringPeriodValueClassBCommonStock | 0 |
| Stock Issued During Period, Value, Conversion of Units | us-gaap_StockIssuedDuringPeriodValueConversionOfUnits | 60,312,000 |
| Issuance of Class C common stock | gnln_StockIssuedDuringPeriodValueClassCCommonStock | 0 |
| Effects of the organizational transactions | gnln_EffectsOfTheReorganizationTransactions | 15,180,000 |
| Issuance of Class A common to stock selling stockholders | gnln_StockIssuedDuringPeriodValueClassACommonStockSellingStockholder | 1,000 |
| Net Income (Loss) Available to Common Stockholders, Basic | us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (1,796,000) |
| Issuance of Class A common units to underwriter upon exercise of overallotment option | gnln_StockIssuedDuringPeriodValueIssuanceOfClassACommonStockToUnderwriter | 0 |
| Dividends | us-gaap_Dividends | 801,000 |
| Adjustment To Additional Paid In Capital Liabilities Under Tax Receivable | gnln_AdjustmentToAdditionalPaidInCapitalLiabilitiesUnderTaxReceivable | 5,173,000 |
| Equity-Based Compensation Recognized Prior To The Organizational Transactions | gnln_EquityBasedCompensationRecognizedPriorToTheOrganizationalTransactions | (137,000) |
| Joint venture consolidation | gnln_JointVentureConsolidation | (60,000) |
| Net loss prior to the organizational transactions | gnln_NetLossPriorToTheReorganizationTransactions | (1,179,000) |
| Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 1,831,000 |
| Issuance of Class A common stock in the IPO, net of underwriting discount | gnln_StockIssuedDuringPeriodValueIssuanceOfClassACommonStock | 83,003,000 |
| Adjustments to Additional Paid in Capital, Other | us-gaap_AdjustmentsToAdditionalPaidInCapitalOther | (3,523,000) |
| Additional Paid-in Capital [Member] | ||
| Issuance of Class B common stock | gnln_StockIssuedDuringPeriodValueClassBCommonStock | (1,000) |
| Stock Issued During Period, Value, Conversion of Units | us-gaap_StockIssuedDuringPeriodValueConversionOfUnits | 60,277,000 |
| Issuance of Class C common stock | gnln_StockIssuedDuringPeriodValueClassCCommonStock | (8,000) |
| Effects of the organizational transactions | gnln_EffectsOfTheReorganizationTransactions | (114,094,000) |
| Issuance of Class A common to stock selling stockholders | gnln_StockIssuedDuringPeriodValueClassACommonStockSellingStockholder | (7,000) |
| Issuance of Class A common units to underwriter upon exercise of overallotment option | gnln_StockIssuedDuringPeriodValueIssuanceOfClassACommonStockToUnderwriter | (4,000) |
| Adjustment To Additional Paid In Capital Liabilities Under Tax Receivable | gnln_AdjustmentToAdditionalPaidInCapitalLiabilitiesUnderTaxReceivable | 5,173,000 |
| Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 709,000 |
| Issuance of Class A common stock in the IPO, net of underwriting discount | gnln_StockIssuedDuringPeriodValueIssuanceOfClassACommonStock | 82,950,000 |
| Adjustments to Additional Paid in Capital, Other | us-gaap_AdjustmentsToAdditionalPaidInCapitalOther | (3,523,000) |
| Noncontrolling Interest [Member] | ||
| Other Comprehensive Income (Loss), Net of Tax | us-gaap_OtherComprehensiveIncomeLossNetOfTax | 24,000 |
| Effects of the organizational transactions | gnln_EffectsOfTheReorganizationTransactions | 99,404,000 |
| Net Income (Loss) Available to Common Stockholders, Basic | us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (1,453,000) |
| Joint venture consolidation | gnln_JointVentureConsolidation | (60,000) |
| Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 1,122,000 |
| AOCI Attributable to Parent [Member] | ||
| Other Comprehensive Income (Loss), Net of Tax | us-gaap_OtherComprehensiveIncomeLossNetOfTax | (8,000) |
| Other Comprehensive Income (Loss), Net of Tax | us-gaap_OtherComprehensiveIncomeLossNetOfTax | 7,000 |
| Effects of the organizational transactions | gnln_EffectsOfTheReorganizationTransactions | 203,000 |
| Retained Earnings [Member] | ||
| Net Income (Loss) Available to Common Stockholders, Basic | us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (343,000) |
| Common Class B [Member] | Common Stock [Member] | ||
| Issuance of Class A common to stock selling stockholders, Shares | gnln_StockIssuedDuringPeriodSharesClassACommonStockSellingStockholder | (106,000) |
| Issuance of Class B common stock | gnln_StockIssuedDuringPeriodValueClassBCommonStock | $ 1,000 |
| Issuance of Class B common stock, Shares | gnln_StockIssuedDuringPeriodSharesClassBCommonStock | 6,157,000 |
| Issuance of Class A common units to underwriter upon exercise of overallotment option, Shares | gnln_StockIssuedDuringPeriodSharesssuanceOfClassACommonStockToUnderwriter | (63,000) |
| Common Class A [Member] | Common Stock [Member] | ||
| Issuance of Class A common to stock selling stockholders, Shares | gnln_StockIssuedDuringPeriodSharesClassACommonStockSellingStockholder | 750,000 |
| Stock Issued During Period, Value, Conversion of Units | us-gaap_StockIssuedDuringPeriodValueConversionOfUnits | $ 35,000 |
| Issuance of Class A common to stock selling stockholders | gnln_StockIssuedDuringPeriodValueClassACommonStockSellingStockholder | 8,000 |
| Issuance of Class A common units to underwriter upon exercise of overallotment option | gnln_StockIssuedDuringPeriodValueIssuanceOfClassACommonStockToUnderwriter | $ 4,000 |
| Issuance of Class A common stock in the IPO, net of underwriting discount, Shares | gnln_StockIssuedDuringPeriodSharesIssuanceOfClassACommonStock | 5,250,000 |
| Issuance of Class A common stock in the IPO, net of underwriting discount | gnln_StockIssuedDuringPeriodValueIssuanceOfClassACommonStock | $ 53,000 |
| Stock Issued During Period, Shares, Conversion of Units | us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits | 3,548,000 |
| Issuance of Class A common units to underwriter upon exercise of overallotment option, Shares | gnln_StockIssuedDuringPeriodSharesssuanceOfClassACommonStockToUnderwriter | 450,000 |
| Redeemable Class B Units [Member] | ||
| Effects of the organizational transactions | gnln_EffectsOfTheReorganizationTransactions | $ (15,181,000) |
| Dividends | us-gaap_Dividends | 76,000 |
| Equity-Based Compensation Recognized Prior To The Organizational Transactions | gnln_EquityBasedCompensationRecognizedPriorToTheOrganizationalTransactions | (113,000) |
| Net loss prior to the organizational transactions | gnln_NetLossPriorToTheReorganizationTransactions | (246,000) |
| MembersEquity/Deficit | ||
| Effects of the organizational transactions | gnln_EffectsOfTheReorganizationTransactions | 29,667,000 |
| Dividends | us-gaap_Dividends | 801,000 |
| Equity-Based Compensation Recognized Prior To The Organizational Transactions | gnln_EquityBasedCompensationRecognizedPriorToTheOrganizationalTransactions | (137,000) |
| Net loss prior to the organizational transactions | gnln_NetLossPriorToTheReorganizationTransactions | $ (1,179,000) |
| Common Class C [Member] | Common Stock [Member] | ||
| Issuance of Class A common to stock selling stockholders, Shares | gnln_StockIssuedDuringPeriodSharesClassACommonStockSellingStockholder | (1,935,000) |
| Issuance of Class C common stock | gnln_StockIssuedDuringPeriodValueClassCCommonStock | $ 8,000 |
| Issuance of Class C common stock, Shares | gnln_StockIssuedDuringPeriodSharesClassCCommonStock | 80,887,000 |
| Issuance of Class A common units to underwriter upon exercise of overallotment option, Shares | gnln_StockIssuedDuringPeriodSharesssuanceOfClassACommonStockToUnderwriter | (1,161,000) |