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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
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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] + References No definition available. + Details
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- Definition Disposition Costs On Sale Of Non-Current Assets + References No definition available. + Details
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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 -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 40 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_40_a&doctype=Standard -URIDate 2017-03-09 + Details
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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 -Name IFRS -Number 5 -IssueDate 2017-01-01 -Paragraph 33 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2017-03-01&anchor=para_33_b_iii&doctype=Standard -URIDate 2017-03-09 + Details
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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] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_16&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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