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OVERVIEW OF BUSINESS AND BASIS OF PRESENTATION (Tables)
 6 Months Ended
Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Changes in Allowance for Doubtful Accounts
The following table summarizes changes in the allowance for doubtful accounts (in thousands):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2020
 
2019

2020
Beginning balance
$
397

 
$
1,383

 
$
169

 
$
255

Bad debt expense (reversal)
402

 
(151
)
 
652

 
1,326

Write-offs, net of recoveries
(227
)
 
(212
)
 
(249
)
 
(561
)
Ending balance
$
572

 
$
1,020

 
$
572

 
$
1,020