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Unaudited Quarterly Supplemental Financial Information
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Supplemental Financial Information
Unaudited Quarterly Supplemental Financial Information
The consolidated statements of operations, presented on a quarterly basis for the years ended December 31, 2018 and 2017, are unaudited. These statements have been prepared in accordance with U.S. GAAP for interim financial information and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the results of operations for the periods presented.
The following presents the Company's consolidated statements of operations by quarter (in thousands) (unaudited):
 
 
2018
 
2017
 
 
Dec. 31
 
Sept. 30
 
June 30
 
March 31
 
Dec. 31
 
Sept. 30
 
June 30
 
March 31
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenue
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Product
 
$
156,671

 
$
125,690

 
$
108,654

 
$
121,307

 
$
66,913

 
$
45,255

 
$
39,935

 
$
27,665

Installation
 
21,363

 
29,690

 
26,245

 
14,118

 
21,601

 
14,978

 
14,354

 
12,293

Service
 
21,752

 
20,751

 
19,975

 
19,907

 
19,927

 
19,511

 
18,875

 
18,591

Electricity
 
13,820

 
14,059

 
14,007

 
14,029

 
14,810

 
14,021

 
13,619

 
13,648

Total revenue
 
213,606

 
190,190

 
168,881

 
169,361

 
123,251

 
93,765

 
86,783

 
72,197

Cost of revenue
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Product
 
128,076

 
95,357

 
70,802

 
80,355

 
70,450

 
53,923

 
47,545

 
38,855

Installation
 
31,819

 
40,118

 
37,099

 
10,438

 
16,933

 
14,696

 
14,855

 
13,445

Service
 
28,475

 
22,651

 
19,260

 
24,253

 
14,012

 
30,058

 
21,308

 
18,219

Electricity
 
7,988

 
8,679

 
8,949

 
10,649

 
9,806

 
10,178

 
8,881

 
10,876

Total cost of revenue
 
196,358

 
166,805

 
136,110

 
125,695

 
111,201

 
108,855

 
92,589

 
81,395

Gross profit (loss)
 
17,248

 
23,385

 
32,771

 
43,666

 
12,050

 
(15,090
)
 
(5,806
)
 
(9,198
)
Operating expenses
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Research and development
 
32,970

 
27,021

 
14,413

 
14,731

 
15,181

 
12,374

 
12,368

 
11,223

Sales and marketing
 
24,983

 
21,476

 
8,254

 
8,262

 
9,346

 
6,561

 
8,663

 
7,845

General and administrative
 
47,471

 
40,999

 
15,359

 
14,988

 
14,818

 
13,652

 
14,325

 
12,879

Total operating expenses
 
105,424

 
89,496

 
38,026

 
37,981

 
39,345

 
32,587

 
35,356

 
31,947

Income (loss) from operations
 
(88,176
)
 
(66,111
)
 
(5,255
)
 
5,685

 
(27,295
)
 
(47,677
)
 
(41,162
)
 
(41,145
)
Interest income
 
1,996

 
1,467

 
444

 
415

 
—

 
—

 
—

 
—

Interest expense
 
(16,178
)
 
(17,191
)
 
(12,688
)
 
(11,390
)
 
(27,846
)
 
(26,946
)
 
(16,140
)
 
(16,847
)
Interest expense to related parties
 
(1,628
)
 
(1,628
)
 
(13,923
)
 
(12,062
)
 
(1,961
)
 
(1,953
)
 
(9,414
)
 
(7,516
)
Other income (expense), net
 
635

 
762

 
559

 
(629
)
 
175

 
(40
)
 
14

 
119

Gain (loss) on revaluation of warrant liabilities and embedded derivatives
 
(13
)
 
1,655

 
(19,197
)
 
(4,034
)
 
(15,114
)
 
572

 
(668
)
 
215

Net loss before income taxes
 
(103,364
)
 
(82,513
)
 
(50,060
)
 
(22,015
)
 
(72,041
)
 
(76,044
)
 
(67,370
)
 
(65,174
)
Income tax provision (benefit)
 
1,079

 
(3
)
 
128

 
333

 
(120
)
 
314

 
228

 
214

Net loss
 
(104,443
)
 
(82,510
)
 
(50,188
)
 
(22,348
)
 
(71,921
)
 
(76,358
)
 
(67,598
)
 
(65,388
)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests
 
(4,662
)
 
(3,931
)
 
(4,512
)
 
(4,632
)
 
(4,160
)
 
(4,527
)
 
(4,123
)
 
(5,856
)
Net loss attributable to Class A and Class B common stockholders
 
$
(99,781
)
 
$
(78,579
)
 
$
(45,677
)
 
$
(17,716
)
 
$
(67,761
)
 
$
(71,831
)
 
$
(63,475
)
 
$
(59,532
)
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted
 
$
(0.91
)
 
$
(0.97
)
 
$
(4.34
)
 
$
(1.70
)
 
$
(6.56
)
 
$
(6.97
)
 
$
(6.22
)
 
$
(5.87
)
Weighted average shares used to compute net loss per share attributable to Class A and Class B common stockholders, basic and diluted
 
109,416

 
81,321

 
10,536

 
10,403

 
10,333

 
10,305

 
10,209

 
10,143