REVENUE

We classify revenue in three categories: service revenue, revenue from reimbursable expenses and non-controlling interests. Service revenue consists of amounts attributable to our fee-based services and sales of short-term investments in real estate. Reimbursable expenses and non-controlling interests are pass-through items for which we earn no margin. Reimbursable expenses consist of amounts we incur on behalf of our customers in performing our fee-based services that we pass directly on to our customers without a markup. Non-controlling interests represent the earnings of Lenders One, a consolidated entity that is a mortgage cooperative managed, but not owned, by Altisource. The Lenders One members’ earnings are included in revenue and reduced from net income to arrive at net income attributable to Altisource (see Note 1). Our services are provided to customers located in the United States. The components of revenue were as follows for the three months ended March 31:



(in thousands)	2020		2019

Service revenue	$	113,176	$	164,999
Reimbursable expenses	7,845		4,496
Non-controlling interests	423		440

Total	$	121,444	$	169,935

Disaggregation of Revenue

Disaggregation of total revenues by major source is as follows:



(in thousands)	Revenue recognized when services are performed or assets are sold		Revenue related to technology platforms and professional services		Reimbursable expenses revenue		Total revenue

Three months ended March 31, 2020	$	108,008	$	5,591	$	7,845	$	121,444
Three months ended March 31, 2019	147,755		17,684		4,496		169,935

Contract Balances

Our contract assets consist of unbilled accounts receivable (see Note 5). Our contract liabilities consist of current deferred revenue as reported on the accompanying condensed consolidated balance sheets and non-current deferred revenue (see Note 14). Revenue recognized that was included in the contract liability at the beginning of the period was $2.5 million and $4.9 million for the three months ended March 31, 2020 and 2019, respectively.