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Stock-Based Compensation (Tables)
 6 Months Ended
Jul. 02, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of stock-based compensation expense by line item on the Statement of Operations
The following table summarizes the consolidated stock-based compensation expense by line item in the Consolidated Statements of Operations:
 
 
Three Months Ended
 
Six Months Ended
(In thousands)
 
July 2, 2017
 
July 3, 2016
 
July 2, 2017
 
July 3, 2016
Cost of Residential revenue
 
$
314

 
$
1,652

 
$
524

 
$
2,479

Cost of Commercial revenue
 
293

 
745

 
542

 
1,397

Cost of Power Plant revenue
 
445

 
3,066

 
1,170

 
5,712

Research and development
 
1,036

 
2,966

 
2,564

 
5,998

Sales, general and administrative
 
6,518

 
8,046

 
11,181

 
17,409

Total stock-based compensation expense
 
$
8,606

 
$
16,475

 
$
15,981

 
$
32,995
Summary of stock-based compensation expense by type of award
The following table summarizes the consolidated stock-based compensation expense by type of award:
 
 
Three Months Ended
 
Six Months Ended
(In thousands)
 
July 2, 2017
 
July 3, 2016
 
July 2, 2017
 
July 3, 2016
Restricted stock units
 
$
9,675

 
$
15,734

 
$
16,911

 
$
33,167

Change in stock-based compensation capitalized in inventory
 
(1,069
)
 
741

 
(930
)
 
(172
)
Total stock-based compensation expense
 
$
8,606

 
$
16,475

 
$
15,981

 
$
32,995