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Loss on sale of assets (Tables)
 12 Months Ended
Dec. 31, 2018
Non-current Assets Held For Sale And Discontinued Operations [Abstract]  
Disclosure of detailed information on sale of assets
 
2018

 
2017

Loss on sale of Power Manager assets
$
(3,957
)
 
$
—

Loss on sale of SOFC assets
(94
)
 
(508
)
Loss on sale of Telecom Backup Power assets
—

 
(866
)
Gain on miscellaneous disposals
2

 
9

 
$
(4,049
)
 
$
(1,365
)
 
2018

 
2017

Cash proceeds received on sale of Power Manager assets
$
2,000

 
$
—

Less: Disposition costs
(707
)
 
—

Net cash proceeds received on sale of Power Manager assets
$
1,293

 
—

Cash proceeds received on sale of SOFC assets
50

 
—

Cash proceeds received on sale of Telecom Backup Power assets
—

 
972

Cash proceeds from miscellaneous disposals
2

 
9

Net cash proceeds received on sale of assets
$
1,345

 
$
981

Cash proceeds received in 2018
$
2,000

Note receivable as of December 31, 2018
2,132

Proceeds receivable (constrained estimate of earn-out payments)
2,000

Total proceeds
6,132

Less: Disposition costs
(707
)
Net proceeds
5,425

Less: Net book value of disposed assets
(9,382
)
Loss on sale of assets in 2018
$
(3,957
)