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Restructuring Activities (Tables)
 6 Months Ended
Jun. 30, 2018
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Activities
Our restructuring activities in the six months ended June 30, 2018 were as follows (in thousands):
 
 
December 31, 2017
 
Six Months Ended June 30, 2018
 
June 30, 2018
 
 
Balance
 
Charges
 
Cash Payments
 
Non-Cash Payments
 
Change in Estimates
 
Balance
Severance and benefits
 
$
2,659

 
$
2,554

 
$
(3,631
)
 
$
—

 
$
—

 
$
1,582

Modification of stock-based compensation awards
 
—

 
105

 
—

 
(105
)
 
—

 
—

Lease termination
 
66

 
21

 
(6
)
 
—

 
—

 
81

Property and equipment impairment due to restructuring
 
—

 
4,375

 
—

 
(4,375
)
 
—

 
—

Professional service fees
 
—

 
356

 
(265
)
 
—

 
—

 
91

Total charged to restructuring charges
 
2,725

 
7,411

 
(3,902
)
 
(4,480
)
 
—

 
1,754

Inventory reserve
 
—

 
168

 
—

 
—

 
—

 
168

Total charged to cost of sales
 
—

 
168

 
—

 
—

 
—

 
168

Ending balance
 
$
2,725

 
$
7,579

 
$
(3,902
)
 
$
(4,480
)
 
$
—

 
$
1,922