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Discontinued Operations - Summary of Financial Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operation, Name of Segment [Extensible List]	slng:MAndIElectricUSOperationsMember	slng:MAndIElectricUSOperationsMember
Net sales	$ 7,750	$ 14,163
Loss from discontinued operations	$ (1,979)	$ (4,838)
Loss per share, basic and diluted	$ (1.80)	$ (4.37)

X

- Definition

Indicates business segment that includes component or group of components disposed of or classified as held-for-sale representing strategic shift that has or will have major effect on operation and financial result.

+ References

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-Section 50
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- Definition

Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

+ References

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- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same.

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