CONTRACT BALANCES (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Schedule of Allowance for Doubtful Accounts Receivable

The allowance for doubtful accounts as of September 30, 2020 and 2019 and changes in the allowance for doubtful accounts during the nine months ended September 30, 2020 and 2019 were as follows (in thousands):

	Nine Months Ended September 30,
	2020		2019
Balance, beginning of period	$	7,686	$	8,685
Add: provision for doubtful accounts	26,802		15,259
Less: write-offs, net of recoveries	(23,172)		(16,165)
Balance, end of period	$	11,316	$	7,779

Contract with Customer, Liability

Changes in deferred revenue during the nine months ended September 30, 2020 were as follows (in thousands):

	Nine Months Ended September 30, 2020
Balance, beginning of period	$	4,315
Less: recognition of deferred revenue from beginning balance	(3,713)
Add: net increase in current period contract liabilities	4,129
Balance, end of period	$	4,731