Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Schedule of Property, Plant and Equipment

Depreciation is calculated using the straight-line method over the estimated depreciable lives of the respective assets as follows:

	Depreciable Lives
Energy Servers	15-21 years
Computers, software and hardware	3-5 years
Machinery and equipment	5-10 years
Furniture and fixtures	3-5 years
Leasehold improvements	1-10 years
Buildings	*

* Lesser of 35 years or the term of the underlying land lease.

Property, plant and equipment, net, consists of the following (in thousands):

	December 31,
	2021		2020
Energy Servers	$	674,799	$	669,422
Computers, software and hardware	21,276		20,432
Machinery and equipment	110,600		106,644
Furniture and fixtures	8,607		8,455
Leasehold improvements	52,936		37,497
Building	48,934		46,730
Construction-in-progress	43,544		21,118
	960,696		910,298
Less: accumulated depreciation	(356,590)		(309,670)
	$	604,106	$	600,628