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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 26, 2017
Equity [Abstract]  
Summary of Changes in Stockholders' Equity
A summary of the changes in stockholders’ equity is provided below (in millions):
 
 
For the Three Months Ended
 
March 26, 2017
 
March 27, 2016
Stockholders’ equity at beginning of period
$
276.4

 
$
254.2

Comprehensive loss:
 

 
 

Net loss
(10.0
)
 
(22.2
)
Change in cumulative translation adjustment
0.1

 
—

Total comprehensive loss
(9.9
)
 
(22.2
)
Stock-based compensation
2.1

 
1.5

Issuance of common stock for cash
81.9

 
—

Issuance of common stock for employee stock purchase plan
1.4

 
1.3

Restricted stock units exchanged for taxes
(0.5
)
 
(0.1
)
Stockholders’ equity at end of period
$
351.4

 
$
234.7
Components of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows (in millions):

 
March 26, 2017
 
March 27, 2016
Cumulative translation adjustment
$
(1.0
)
 
$
(0.6
)
Post-retirement benefit reserve adjustment net of tax expense
(0.6
)
 
(0.8
)
Total accumulated other comprehensive loss
$
(1.6
)
 
$
(1.4
)
Rollforward of Common Stock Outstanding
Common stock issued by the Company for the three months ended March 26, 2017 and March 27, 2016 was as follows (in millions):
 
 
For the Three Months Ended
 
March 26, 2017
 
March 27, 2016
Shares outstanding at beginning of the period
73.9

 
59.1

Stock issued for cash
11.9

 
—

Stock issued for employee stock purchase plan, stock options and restricted stock units exercised
0.6

 
0.5

Shares outstanding at end of the period
86.4

 
59.6