Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 168,881	$ 86,783	$ 338,242	$ 158,980
Cost of revenue	136,110	92,589	261,805	173,984
Gross profit (loss)	32,771	(5,806)	76,437	(15,004)
Operating expenses
Research and development	14,413	12,368	29,144	23,591
Sales and marketing	8,254	8,663	16,516	16,508
General and administrative	15,359	14,325	30,347	27,204
Total operating expenses	38,026	35,356	76,007	67,303
Profit (loss) from operations	(5,255)	(41,162)	430	(82,307)
Interest expense	(26,167)	(25,554)	(49,204)	(49,917)
Other income (expense), net	559	14	(70)	133
Loss on revaluation of warrant liabilities and embedded derivatives	(19,197)	(668)	(23,231)	(453)
Net loss before income taxes	(50,060)	(67,370)	(72,075)	(132,544)
Income tax provision	128	228	461	442
Net loss	(50,188)	(67,598)	(72,536)	(132,986)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests	(4,512)	(4,123)	(9,143)	(9,979)
Net loss attributable to common shareholders	$ (45,677)	$ (63,475)	$ (63,393)	$ (123,007)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (4.34)	$ (6.22)	$ (6.05)	$ (12.09)
Weighted average shares used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)	10,536	10,209	10,470	10,176
Product
Revenue	$ 108,654	$ 39,935	$ 229,961	$ 67,600
Cost of revenue	70,802	47,545	151,157	86,400
Installation
Revenue	26,245	14,354	40,363	26,647
Cost of revenue	37,099	14,855	47,537	28,301
Service
Revenue	19,975	18,875	39,882	37,466
Cost of revenue	19,260	21,308	43,513	39,526
Electricity
Revenue	14,007	13,619	28,036	27,267
Cost of revenue	$ 8,949	$ 8,881	$ 19,598	$ 19,757