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Commitments and Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Potential liability related to asset purchase agreement	$ 4.3

X

- Definition

Potential liability related to asset purchase agreement.

+ References

No definition available.

+ Details

Name:	slng_PotentialLiabilityRelatedToAssetPurchaseAgreement
Namespace Prefix:	slng_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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