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Long-Term Debt and Other Financing Arrangements - Obligations Under Vendor Financing Arrangement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Vendor Financing Obligations [Roll Forward] |  |
Vendor financing, beginning balance | $ 59,575 | $ 0
Invoices confirmed during the periods | 0 | 73,575
Confirmed invoices paid during the periods | (59,575) | (14,000)
Vendor financing, ending balance | $ 0 | $ 59,575

X
- Definition Repayment Of Vendor Financing + References No definition available. + Details
Name: | gsat_RepaymentOfVendorFinancing
Namespace Prefix: | gsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Vendor Financing, Current + References No definition available. + Details
Name: | gsat_VendorFinancingCurrent
Namespace Prefix: | gsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Vendor Financing, Deferral Of Milestone Payments + References No definition available. + Details
Name: | gsat_VendorFinancingDeferralOfMilestonePayments
Namespace Prefix: | gsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Vendor Financing Obligations + References No definition available. + Details
Name: | gsat_VendorFinancingObligationsRollForward
Namespace Prefix: | gsat_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration