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Stockholders' Equity (Tables)
 9 Months Ended
Oct. 01, 2017
Equity [Abstract]  
Summary of Changes in Stockholders' Equity
A summary of the changes in stockholders’ equity is provided below (in millions):
 
 
For the Nine Months Ended
 
October 1, 2017
 
September 25, 2016
Stockholders’ equity at beginning of period
$
276.4

 
$
254.2

Comprehensive loss:
 

 
 

Net loss
(20.5
)
 
(56.2
)
Change in cumulative translation adjustment
(0.1
)
 
(0.2
)
Total comprehensive loss
(20.6
)
 
(56.4
)
Exercise of stock options and warrants
0.4

 
—

Stock-based compensation
6.8

 
4.2

Issuance of common stock for cash
267.8

 
—

Issuance of common stock for employee stock purchase plan
3.1

 
2.6

Restricted stock units traded for taxes
(2.0
)
 
(0.5
)
Stockholders’ equity at end of period
$
531.9

 
$
204.1
Components of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows (in millions):

 
October 1, 2017
 
September 25, 2016
Cumulative translation adjustment
$
(1.2
)
 
$
(0.8
)
Post-retirement benefit reserve adjustment net of tax expense
(0.6
)
 
(0.8
)
Total accumulated other comprehensive loss
$
(1.8
)
 
$
(1.6
)
Rollforward of Common Stock Outstanding
Common stock issued by the Company for the nine months ended October 1, 2017 and September 25, 2016 was as follows (in millions):
 
 
For the Nine Months Ended
 
October 1, 2017
 
September 25, 2016
Shares outstanding at beginning of the period
73.9

 
59.1

Stock issued for cash
28.0

 
—

Stock issued for employee stock purchase plan, stock options and restricted stock units exercised
1.4

 
1.4

Shares outstanding at end of the period
103.3

 
60.5