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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Restructuring Activities
The following tables set forth details regarding the activities described above during the years ended December 31, 2017 and 2016:

 
Balance as of January 1, 2017
 
Expenses,
Net
 
Cash
 
Noncash
 
Balance as of December 31, 2017
 
(in thousands)
Employee severance and other personnel benefits:
 
 
 
 
 
 
 
 
 
2017 Workforce reduction
$
—

 
$
5,897

 
$
(5,768
)
 
$
(129
)
 
$
—

2016 Workforce reduction
1,854

 
—

 
(1,038
)
 
(816
)
 
—

Total
$
1,854

 
$
5,897

 
$
(6,806
)
 
$
(945
)
 
$
—