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Restructuring (Tables)
 6 Months Ended
Jun. 30, 2019
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
Restructuring activities for the six months ended June 30, 2019 were as follows (in thousands):
 
Employee Severance
 
Facilities Consolidation
 
Others
 
Total
Restructuring obligations December 31, 2018
$
436

 
$
769

 
$
1,611

 
$
2,816

Charges
88

 
—

 
170

 
258

Cash payments
(523
)
 
(90
)
 
(141
)
 
(754
)
Settlement of Rusnano payment derivative
—

 
—

 
(1,611
)
 
(1,611
)
Adoption of ASC 842
—

 
(620
)
 
—

 
(620
)
Restructuring obligations June 30, 2019
$
1

 
$
59

 
$
29

 
$
89