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Restructuring and Asset Impairment Charges (Tables)
 6 Months Ended
Jun. 30, 2019
Restructuring and Related Activities [Abstract]  
Summary of Restructuring Activity
The following table presents accrued restructuring activity for the six months ended June 30, 2019 and the twelve months ended December 31, 2018 (in thousands):

 
Contract
termination
costs
 
Employee severance
and termination
benefits
 
Total
Accrued restructuring balance as of December 31, 2017
$
558

 
$
—

 
$
558

Restructuring expenses
—

 
4,683

 
4,683

Cash payments
(91
)
 
(4,341
)
 
(4,432
)
Accrued restructuring balance as of December 31, 2018
467

 
342

 
809

Cash payments
(46
)
 
(313
)
 
(359
)
Accrued restructuring balance as of June 30, 2019
$
421

 
$
29

 
$
450