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Restructuring Activities (Tables)
 12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Activities
Our restructuring activities for 2018 and 2017 were as follows (in thousands):
 
 
December 31, 2017
 
2018
 
December 31, 2018
 
 
Balance
 
Charges
 
Cash Payments
 
Non-Cash Payments
 
Change in Estimates
 
Balance
Severance and benefits
 
$
2,659

 
$
5,018

 
$
(4,346
)
 
$
—

 
$
(700
)
 
$
2,631

Modification of stock-based compensation awards
 
—

 
105

 
—

 
(105
)
 
—

 
—

Lease termination
 
66

 
864

 
(69
)
 
—

 
—

 
861

Property and equipment impairment due to restructuring
 
—

 
6,207

 
—

 
(6,207
)
 
—

 
—

Professional service fees
 
—

 
1,165

 
(1,122
)
 
—

 
—

 
43

Other
 
—

 
1,312

 
(896
)
 
—

 
—

 
416

Total charged to restructuring charges
 
2,725

 
14,671

 
(6,433
)
 
(6,312
)
 
(700
)
 
3,951

Inventory reserve
 
—

 
121

 
—

 
—

 
(71
)
 
50

Total charged to cost of sales
 
—

 
121

 
—

 
—

 
(71
)
 
50

Ending balance
 
$
2,725

 
$
14,792

 
$
(6,433
)
 
$
(6,312
)
 
$
(771
)
 
$
4,001