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RESTRUCTURING EXPENSES (Tables)
 12 Months Ended
Dec. 31, 2019
Restructuring and Related Activities [Abstract]  
Schedule of components of restructuring expenses and current liabilities
The following table displays charges taken related to restructuring activities during the year ended December 31, 2019 and a rollforward of the changes to the accrued balances as of December 31, 2019 (in thousands): 
 
Workforce reduction
 
Contract termination
 
Other
 
Total
Balance accrued at December 31, 2018
$
—

 
$
—

 
$
—

 
$
—

2019 restructuring charges
7,034

 
229

 
157

 
7,420

Payments
(6,237
)
 
(229
)
 
(157
)
 
(6,623
)
Balance accrued at December 31, 2019
$
797

 
$
—

 
$
—

 
$
797