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Loss on sale of assets - Narrative (Details) - USD ($) | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2017
Disclosure on Sale of Assets [Line Items] |  |  |
Loss on sale of assets | $ 4,049,000 | $ 1,365,000 |
Proceeds receivable | 2,000,000 | 0 |
Cash proceeds received on sale | 1,345,000 | 981,000 |
Power Manager assets |  |  |
Disclosure on Sale of Assets [Line Items] |  |  |
Cash proceeds received | 2,000,000 |  |
Note receivable | 2,132,000 |  |
Maximum possible earn-out amount | $ 11,250,000 |  |
Earn-out period | 12 months |  |
Loss on sale of assets | $ 3,957,000 | 0 |
Proceeds receivable | 2,000,000 |  |
Cash proceeds received on sale | 2,000,000 | 0 |
SOFC assets |  |  |
Disclosure on Sale of Assets [Line Items] |  |  |
Loss on sale of assets | 94,000 | 508,000 |
Cash proceeds received on sale | 50,000 | 0 |
Telecom backup power assets |  |  |
Disclosure on Sale of Assets [Line Items] |  |  |
Loss on sale of assets | 0 | 866,000 |
Cash proceeds received on sale | $ 0 | $ 972,000 |
Estimated fair value of earn-out payments |  |  | $ 0

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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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