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 one of 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 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. 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 $19.7 million and $22.5 million is recorded in the current liabilities section of the accompanying condensed consolidated balance sheets as of June 30, 2019 and December 31, 2018, respectively. The change in this contract liability balance during the six month period ended June 30, 2019 is the result of payments received in advance of satisfying performance obligations, offset by revenue recognized during that period. Revenue recognized for the six month period ended June 30, 2019 that was included in the contract liability balance at the beginning of the year was $21.3 million.

The following table depicts the timing of revenue recognition:

	Three months ended June 30, 2019								Six months ended June 30, 2019
	Transportation and Skilled Trades Segment		Healthcare and Other Professions Segment		Transitional Segment		Consolidated		Transportation and Skilled Trades Segment		Healthcare and Other Professions Segment		Transitional Segment		Consolidated
Timing of Revenue Recognition
Services transferred at a point in time	$	2,487	$	1,159	$	-	$	3,646	$	4,568	$	2,233	$	-	$	6,801
Services transferred over time		41,541		18,382		-		59,923		83,786		36,246		-		120,032
Total revenues	$	44,028	$	19,541	$	-	$	63,569	$	88,354	$	38,479	$	-	$	126,833

	Three months ended June 30, 2018								Six months ended June 30, 2018
	Transportation and Skilled Trades Segment		Healthcare and Other Professions Segment		Transitional Segment		Consolidated		Transportation and Skilled Trades Segment		Healthcare and Other Professions Segment		Transitional Segment		Consolidated
Timing of Revenue Recognition
Services transferred at a point in time	$	1,657	$	954	$	3	$	2,614	$	3,705	$	1,686	$	5	$	5,396
Services transferred over time		40,428		16,608		1,470		58,506		81,127		32,618		3,868		117,613
Total revenues	$	42,085	$	17,562	$	1,473	$	61,120	$	84,832	$	34,304	$	3,873	$	123,009