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Restructuring (Tables)
 9 Months Ended
Sep. 30, 2019
Restructuring and Related Activities [Abstract]  
Schedule of restructuring and related costs Restructuring activities for the nine months ended September 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

 
—

 
173

 
261

Cash payments
(524
)
 
(130
)
 
(171
)
 
(825
)
Settlement of Rusnano payment derivative
—

 
—

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

 
(620
)
 
—

 
(620
)
Restructuring obligations September 30, 2019
$
—

 
$
19

 
$
2

 
$
21