Segment and Geographical Information - Reconciliation of Segment Gross Profit to Condensed Consolidated GAAP Gross Profit (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 04, 2021	Mar. 29, 2020
Segment Reporting Information [Line Items]
Gross profit	$ 49,874	$ 29,184
Construction revenue on solar services contracts	306,398	290,546
Stock-based compensation expense	5,437	6,867
Operating Segments
Segment Reporting Information [Line Items]
Gross profit	56,884	22,755
Intersegment revenue
Segment Reporting Information [Line Items]
Gross profit	449	13,044
Construction revenue on solar services contracts	11	(19,879)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Legacy utility and power plant projects	0	207
Construction revenue on solar services contracts	0	(5,392)
Results of operations of legacy business to be exited	621	0
Gross Profit \| Segment Reconciling Items
Segment Reporting Information [Line Items]
Legacy utility and power plant projects	0	34
Legacy sale-leaseback transactions	0	(20)
Gain on sale and impairment of residential lease assets	494	448
Construction revenue on solar services contracts	0	(4,734)
Stock-based compensation expense	(887)	(559)
Amortization of intangible assets	0	(1,784)
Results of operations of legacy business to be exited	$ (7,066)	$ 0

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