v2.4.1.9

Warrant derivative liability (Public warrants) (Details) (Public Warrants [Member], USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Mar. 31, 2008	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Public Warrants [Member]
Warrant Activity [Line Items]
Public Offering units sold	4,239,300sgoc_PublicOfferingUnitsSold / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Per unit selling price	$ 8.00us-gaap_EquityIssuancePerShareAmount / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Warrants outstanding	4,239,300us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember			598,850us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember	598,850us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Warrants redeemed	2,673,273sgoc_WarrantsRedeemed / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Warrant redemption price per share	$ 0.50sgoc_WarrantRedemptionPricePerShare / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Warrants repurchased		967,177sgoc_WarrantsRepurchased / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Warrants repurchased, value		$ 361sgoc_WarrantsRepurchasedValue / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Warrants repurchased, average price per share		$ 0.37sgoc_WarrantsRepurchasedAveragePricePerShare / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Warrant, cap price		11.50us-gaap_DerivativeCapPrice / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Warrant exercise price per share, after price cap exceeded		$ 0.01sgoc_WarrantExercisePricePerShareAfterCapPriceExceeded / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Market price per share				$ 0.02sgoc_QuotedMarketPricePerShare / us-gaap_ClassOfWarrantOrRightAxis = sgoc_PublicWarrantsMember
Expiration date		Mar. 07, 2014

X

- Definition

Date the warrants or rights expire.

+ References

No definition available.

+ Details

Name:	sgoc_ClassOfWarrantOrRighstExpirationDate
Namespace Prefix:	sgoc_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Public Offering Units Sold (A unit consists of one ordinary share and one warrant)

+ References

No definition available.

+ Details

Name:	sgoc_PublicOfferingUnitsSold
Namespace Prefix:	sgoc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Quoted market price per share.

+ References

No definition available.

+ Details

Name:	sgoc_QuotedMarketPricePerShare
Namespace Prefix:	sgoc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Exercise price per share of warrants after cap price has been exceeded.

+ References

No definition available.

+ Details

Name:	sgoc_WarrantExercisePricePerShareAfterCapPriceExceeded
Namespace Prefix:	sgoc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Warrant redemption price per share.

+ References

No definition available.

+ Details

Name:	sgoc_WarrantRedemptionPricePerShare
Namespace Prefix:	sgoc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of warrants redeemed.

+ References

No definition available.

+ Details

Name:	sgoc_WarrantsRedeemed
Namespace Prefix:	sgoc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of warrants repurchased.

+ References

No definition available.

+ Details

Name:	sgoc_WarrantsRepurchased
Namespace Prefix:	sgoc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Warrants repurchased average price per share.

+ References

No definition available.

+ Details

Name:	sgoc_WarrantsRepurchasedAveragePricePerShare
Namespace Prefix:	sgoc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The value of warrants repurchased.

+ References

No definition available.

+ Details

Name:	sgoc_WarrantsRepurchasedValue
Namespace Prefix:	sgoc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeCapPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount per share or per unit assigned to the consideration received of equity securities issued for development stage entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 915

-SubTopic 215

-Section 45

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6472370&loc=d3e38297-110927

+ Details

Name:	us-gaap_EquityIssuancePerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration