CONTRACT BALANCES

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Contract Balances

CONTRACT BALANCES

The allowance for doubtful accounts as of March 31, 2018, and changes in the allowance for doubtful accounts during the three months ended March 31, 2018, were as follows (in thousands):

	Three Months Ended March 31, 2018
Balance, beginning of period	$	8,602
Add: bad debt expense	7,636
Less: write-offs, net of recoveries	(6,103		)
Balance, end of period	$	10,135

Contract liabilities include deferred revenue on the consolidated balance sheets when the Company has received consideration, or has the right to receive consideration, in advance of the transfer of the performance obligations of the contract to the customer.

As of March 31, 2018, deferred revenue was $3.5 million, the majority of which is expected to be recognized as revenue in the subsequent three-month period ending June 30, 2018. Changes in deferred revenue during the three months ended March 31, 2018 were as follows (in thousands):

	Three Months Ended March 31, 2018
Balance, beginning of period	$	3,469
Less: Recognition of deferred revenue from beginning balance	(2,179		)
Add: Net increase in current period contract liabilities	2,184
Balance, end of period	$	3,474

No other contract assets or liabilities are recorded on the Company's condensed consolidated balance sheets as of March 31, 2018 and December 31, 2017.