Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 207,228	$ 200,305	$ 629,705	$ 544,860
Cost of revenue	170,345	144,318	500,827	442,693
Gross profit	36,883	55,987	128,878	102,167
Operating expenses:
Research and development	27,634	19,231	76,602	61,887
Sales and marketing	20,124	11,700	62,803	37,076
General and administrative	33,014	25,428	90,470	79,471
Total operating expenses	80,772	56,359	229,875	178,434
Loss from operations	(43,889)	(372)	(100,997)	(76,267)
Interest income	72	254	222	1,405
Interest expense	(14,514)	(19,902)	(43,798)	(55,030)
Interest expense - related parties	0	(353)	0	(2,513)
Other income (expense), net	2,011	(221)	1,948	(4,142)
Gain (loss) on extinguishment of debt	0	1,220	0	(12,878)
(Loss) gain on revaluation of embedded derivatives	(184)	1,505	(1,644)	2,201
Loss before income taxes	(56,504)	(17,869)	(144,269)	(147,224)
Income tax provision	158	7	595	272
Net loss	(56,662)	(17,876)	(144,864)	(147,496)
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interest	(4,292)	(5,922)	(13,742)	(17,081)
Net loss attributable to Class A and Class B common stockholders	$ (52,370)	$ (11,954)	$ (131,122)	$ (130,415)
Net loss per share attributable to Class A and Class B common stockholders, basic (in dollars per share)	$ (0.30)	$ (0.09)	$ (0.76)	$ (1.01)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in dollars per share)	$ (0.30)	$ (0.09)	$ (0.76)	$ (1.01)
Weighted average shares used to compute net loss per share available to Class A and Class B common stockholders, basic (in shares)	174,269	138,964	172,601	129,571
Weighted average shares used to compute net loss per share available to Class A and Class B common stockholders, diluted (in shares)	174,269	138,964	172,601	129,571
Product
Revenues	$ 128,550	$ 131,076	$ 413,347	$ 346,832
Cost of revenue	93,704	72,037	289,889	227,653
Installation
Revenues	22,172	26,603	53,710	73,060
Cost of revenue	25,616	27,872	66,756	86,938
Service
Revenues	39,251	26,141	111,375	77,496
Cost of revenue	39,586	33,214	111,269	92,836
Electricity
Revenues	17,255	16,485	51,273	47,472
Cost of revenue	$ 11,439	$ 11,195	$ 32,913	$ 35,266