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Stock-Based Compensation (Tables)
 3 Months Ended
Apr. 03, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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
(In thousands)
 
April 3, 2016
 
March 29, 2015
Cost of Residential revenue
 
$
827

 
$
922

Cost of Commercial revenue
 
652

 
388

Cost of Power Plant revenue
 
2,646

 
1,256

Research and development
 
3,032

 
2,273

Sales, general and administrative
 
9,363

 
8,707

Total stock-based compensation expense
 
$
16,520

 
$
13,546
Summary of stock-based compensation expense by type of award
The following table summarizes the consolidated stock-based compensation expense by type of awards:
 
 
Three Months Ended
(In thousands)
 
April 3, 2016
 
March 29, 2015
Restricted stock units
 
$
17,433

 
$
14,504

Change in stock-based compensation capitalized in inventory
 
(913
)
 
(958
)
Total stock-based compensation expense
 
$
16,520

 
$
13,546