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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 25, 2017
Equity [Abstract]  
Summary of Changes in Stockholders' Equity
A summary of the changes in stockholders’ equity is provided below (in millions):
 
 
For the Six Months Ended
 
June 25, 2017
 
June 26, 2016
Stockholders’ equity at beginning of period
$
276.4

 
$
254.2

Comprehensive loss:
 

 
 

Net loss
(16.2
)
 
(32.6
)
Change in cumulative translation adjustment
0.1

 
(0.1
)
Total comprehensive loss
(16.1
)
 
(32.7
)
Exercise of stock options and warrants
0.4

 
—

Stock-based compensation
4.0

 
3.1

Issuance of common stock for cash
81.9

 
—

Issuance of common stock for employee stock purchase plan
1.4

 
1.3

Restricted stock units traded for taxes
(1.0
)
 
(0.3
)
Stockholders’ equity at end of period
$
347.0

 
$
225.6
Components of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows (in millions):

 
June 25, 2017
 
June 26, 2016
Cumulative translation adjustment
$
(0.9
)
 
$
(0.7
)
Post-retirement benefit reserve adjustment net of tax expense
(0.6
)
 
(0.8
)
Total accumulated other comprehensive loss
$
(1.5
)
 
$
(1.5
)
Rollforward of Common Stock Outstanding
Common stock issued by the Company for the six months ended June 25, 2017 and June 26, 2016 was as follows (in millions):
 
 
For the Six Months Ended
 
June 25, 2017
 
June 26, 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
0.8

 
0.6

Shares outstanding at end of the period
86.6

 
59.7