v3.21.2

Employee pension (Additional Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Percentage of monthly contributions made by the company to the state retirement plan | 20.00% |  |
Percentage of monthly salaries for all Australia based employees to mandatory provident fund Schemes | 5.00% |  |
Percentage of monthly salaries for all Australia based employees to Superannuation Schemes | 9.50% |  |
Continuing Operations [Member] |  |  |
Pension expense | $ 20 | $ 21 | $ 8
Discontinued Operations [Member] |  |  |
Pension expense | $ 4 | $ 4 | $ 5

X
- Definition Percentage of monthly contributions made by the company to the state retirement plan. + References No definition available. + Details
Name: | sgoc_PercentageOfMonthlyContributionsMadeByCompanyToStateRetirementPlan
Namespace Prefix: | sgoc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of monthly contributions made by the Company for all Australia based employees to the Superannuation schemes. + References No definition available. + Details
Name: | sgoc_PercentageOfMonthlyContributionsMadeForAustraliaBasedEmployeesToSuperanuationSchemes
Namespace Prefix: | sgoc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of monthly contributions made by the Company for all Hong Kong based employees to the mandatory provident fund schemes. + References No definition available. + Details
Name: | sgoc_PercentageOfMonthlyContributionsMadeForHongKongBasedEmployeesToMandatoryProvidentFundSchemes
Namespace Prefix: | sgoc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits. + References No definition available. + Details
Name: | us-gaap_PensionExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementOperatingActivitiesSegmentAxis=us-gaap_SegmentContinuingOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementOperatingActivitiesSegmentAxis=us-gaap_SegmentDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |