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Restructuring Activities (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Activities
Our restructuring activities for 2017 and 2016 were as follows (in thousands):
 
 
December 31, 2016
 
2017
 
December 31, 2017
 
 
Balance
 
Charges
 
Cash Payments
 
Non-Cash Payments
 
Change in Estimates
 
Balance
Severance and benefits
 
$
—

 
$
3,337

 
$
(678
)
 
$
—

 
$
—

 
$
2,659

Modification of stock-based compensation awards
 
—

 
1,334

 
—

 
(1,334
)
 
—

 
—

Lease termination
 
654

 
18

 
(670
)
 
—

 
64

 
66

Property and equipment impairment due to restructuring
 
—

 
3,607

 
—

 
(3,607
)
 
—

 
—

Inventory write down
 
—

 
478

 
—

 
(478
)
 
—

 
—

Ending balance
 
$
654

 
$
8,774

 
$
(1,348
)
 
$
(5,419
)
 
$
64

 
$
2,725