Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 794,247	$ 785,177	$ 632,648
Cost of revenue	628,454	687,590	526,898
Gross profit	165,793	97,587	105,750
Operating expenses:
Research and development	83,577	104,168	89,135
Sales and marketing	55,916	73,573	62,807
General and administrative	107,085	152,650	118,817
Total operating expenses	246,578	330,391	270,759
Loss from operations	(80,785)	(232,804)	(165,009)
Interest income	1,475	5,661	4,322
Interest expense	(76,276)	(87,480)	(97,021)
Interest expense - related parties	(2,513)	(6,756)	(8,893)
Other income (expense), net	(8,318)	706	(999)
Loss on extinguishment of debt	(12,878)	0	0
Gain (loss) on revaluation of embedded derivatives	464	(2,160)	(22,139)
Loss before income taxes	(178,831)	(322,833)	(289,739)
Income tax provision	256	633	1,537
Net loss	(179,087)	(323,466)	(291,276)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests	(21,534)	(19,052)	(17,736)
Net loss attributable to Class A and Class B common stockholders	(157,553)	(304,414)	(273,540)
Less: deemed dividend to noncontrolling interest	0	(2,454)	0
Net loss available to Class A and Class B common stockholders	$ (157,553)	$ (306,868)	$ (273,540)
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted (in dollars per share)	$ (1.14)	$ (2.67)	$ (5.14)
Weighted average shares used to compute net loss per share available to Class A and Class B common stockholders, basic and diluted (in shares)	138,722	115,118	53,268
Product
Revenues	$ 518,633	$ 557,336	$ 400,638
Cost of revenue	332,724	435,479	281,275
Installation
Revenues	101,887	60,826	68,195
Cost of revenue	116,542	76,487	95,306
Service
Revenues	109,633	95,786	83,267
Cost of revenue	132,329	100,238	100,689
Electricity
Revenues	64,094	71,229	80,548
Cost of revenue	$ 46,859	$ 75,386	$ 49,628