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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 1 Months Ended
--- | ---
Aug. 31, 2018 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