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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2019
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs The table below summarizes the activity in the restructuring liability (in thousands):
 
Employee-Related Termination Costs
 
Contract Termination Costs
 
Total
Balance as of December 31, 2017
$
1,202

 
$
681

 
$
1,883

Restructuring charges
288

 
—

 
288

Payments
(1,490
)
 
(157
)
 
(1,647
)
Balance as of December 31, 2018
$
—

 
$
524

 
$
524

Payments
—

 
(524
)
 
(524
)
Balance as of December 31, 2019
$
—

 
$
—

 
$
—