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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
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
 
September 30, 2018
 
October 1, 2017
Stockholders’ equity at beginning of period
$
511.5

 
$
276.4

Impact from the adoption of ASC 606 (Note 1)
(0.2
)
 
—

Comprehensive loss:
 

 
 

Net loss
(8.2
)
 
(20.5
)
Change in cumulative translation adjustment
—

 
(0.1
)
Total comprehensive loss
(8.2
)
 
(20.6
)
Exercise of stock options and warrants
0.1

 
0.4

Stock-based compensation
5.1

 
6.8

Issuance of common stock for cash
—

 
267.8

Issuance of common stock for employee stock purchase plan
3.7

 
3.1

Restricted stock units traded for taxes
(0.1
)
 
(2.0
)
Stockholders’ equity at end of period
$
511.9

 
$
531.9
Components of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows (in millions):

 
For the Nine Months Ended
 
September 30, 2018
 
October 1, 2017
Cumulative translation adjustment
$
(0.9
)
 
$
(1.2
)
Post-retirement benefit reserve adjustment net of tax expense
(0.4
)
 
(0.6
)
Accumulated other comprehensive loss
$
(1.3
)
 
$
(1.8
)
Rollforward of Common Stock Outstanding
Common stock issued by the Company for the nine months ended September 30, 2018 and October 1, 2017 was as follows (in millions):
 
 
For the Nine Months Ended
 
September 30, 2018
 
October 1, 2017
Shares outstanding at beginning of the period
103.3

 
73.9

Stock issued for cash
—

 
28.0

Stock issued for employee stock purchase plan, stock options and restricted stock units exercised
0.5

 
1.4

Shares outstanding at end of the period
103.8

 
103.3