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Loss on sale of assets - Gain (loss) on sale of assets and proceeds from sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure on Sale of Assets [Line Items]
Gain (loss) on sale of assets	$ (4,049)	$ (1,365)
Cash proceeds received on sale	1,345	981
Power Manager assets
Disclosure on Sale of Assets [Line Items]
Gain (loss) on sale of assets	(3,957)	0
Cash proceeds received on sale	2,000	0
Less: Disposition costs	(707)	0
Net proceeds	1,293	0
SOFC assets
Disclosure on Sale of Assets [Line Items]
Gain (loss) on sale of assets	(94)	(508)
Cash proceeds received on sale	50	0
Telecom backup power assets
Disclosure on Sale of Assets [Line Items]
Gain (loss) on sale of assets	0	(866)
Cash proceeds received on sale	0	972
Miscellaneous disposals
Disclosure on Sale of Assets [Line Items]
Gain (loss) on sale of assets	2	9
Cash proceeds received on sale	$ 2	$ 9

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- Definition

[Line Items] for Disclosure on Sale of Assets [Table]

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- Definition

Disposition Costs On Sale Of Non-Current Assets

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- Definition

The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The gain (loss) recognised on the measurement to fair value less costs to sell or on the disposal of the assets or disposal group(s) constituting the discontinued operation. [Refer: Discontinued operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The cash inflow from the disposal of non-current assets or disposal groups classified as held for sale and discontinued operations. [Refer: Discontinued operations [member]; Disposal groups classified as held for sale [member]; Non-current assets or disposal groups classified as held for sale]

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