3.	REVENUE RECOGNITION

Substantially all of our revenues are considered to be revenues from contracts with students. The related accounts receivable balances are recorded in our balance sheets as student accounts receivable. We do not have significant revenue recognized from performance obligations that were satisfied in prior periods, and we do not have any transaction price allocated to unsatisfied performance obligations other than in our unearned tuition. We record revenue for students who withdraw from our schools only to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur. Unearned tuition represents contract liabilities primarily related to our tuition revenue. We have elected not to provide disclosure about transaction prices allocated to unsatisfied performance obligations if original contract durations are less than one-year, or if we have the right to consideration from a student in an amount that corresponds directly with the value provided to the student for performance obligations completed to date in accordance with ASC 606. We have assessed the costs incurred to obtain a contract with a student and determined them to be immaterial.

Unearned tuition in the amount of $18.3 million and $23.4 million is recorded in the current liabilities section of the accompanying condensed consolidated balance sheets as of March 31, 2020 and December 31, 2019, respectively. The change in this contract liability balance during the three month period ended March 31, 2020 is the result of payments received in advance of satisfying performance obligations, offset by revenue recognized during that period. Revenue recognized for the three month period ended March 31, 2020 that was included in the contract liability balance at the beginning of the year was $20.1 million.

The following table depicts the timing of revenue recognition:

Three months ended March 31, 2020	Transportation and Skilled Trades Segment		Healthcare and Other Professions Segment		Consolidated
Timing of Revenue Recognition
Services transferred at a point in time	$	2,498	$	1,073	$	3,571
Services transferred over time		46,558		19,912		66,470
Total revenues	$	49,056	$	20,985	$	70,041

Three months ended March 31, 2019	Transportation and Skilled Trades Segment		Healthcare and Other Professions Segment		Consolidated
Timing of Revenue Recognition
Services transferred at a point in time	$	2,081	$	1,075	$	3,156
Services transferred over time		42,244		17,863		60,107
Total revenues	$	44,325	$	18,938	$	63,263