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RESTRUCTURING PLAN (Tables)
 12 Months Ended
Dec. 31, 2019
Restructuring and Related Activities [Abstract]  
Summary of Restructuring Activity
The following table summarizes the Company’s accrued restructuring liability balance and associated activity (in thousands):
 
December 31, 2018
 
Additions
 
Cash Payments
 
December 31, 2019
Retention
$
—

 
$
1,013

 
$
(78
)
 
$
935

Severance and severance-related expenses
—

 
1,021

 
(441
)
 
580

Total restructuring liability
$
—

 
$
2,034

 
$
(519
)
 
$
1,515