Revenue (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Revenue from the sale of Drive Systems:
Revenue direct to customers	$	662	$	863	$	773	$	1,061
Revenue through channel partners		620		1,050		1,184		2,083
Revenue from the sale of XL Grid solutions – which are sold direct to customers		2,412		-		2,412		-
Total revenue	$	3,694	$	1,913	$	4,369	$	3,144

Schedule of accrued warranty liability

	For the Six Months Ended June 30, 2021			For the Year Ended December 31, 2020
Balance at the beginning of the period	$	1,735		$	1,009
Acquisition date accrual for World Energy acquisition		25			-
Accrual for warranties issued		98			912
Warranty fulfillment charges		(201	)		(186	)
Balance at the end of the period	$	1,657		$	1,735