Revenue (Tables)

3 Months Ended

Mar. 31, 2021

The following table represents a disaggregation of revenue by type of goods or services for the three months ended March 31, 2021 and 2020, along with the reportable segment for each category:

(in thousands)

	Three months ended
	March 31, 2021		March 31, 2020
Performance Improvement Solutions segment
System Design and Build	$	1,862	$	3,813
Point in time		-		-
Over time		1,862		3,813

Software and Support		813		910
Point in time		95		640
Over time		718		270

Training and Consulting Services		4,406		4,988
Point in time		68		29
Over time		4,338		4,959

Nuclear Industry Training and Consulting segment
Training and Consulting Services		6,023		7,994
Point in time		86		-
Over time		5,937		7,994

Total revenue	$	13,104	$	17,705

Balance of Contract Liabilities and Revenue Recognized in Reporting Period

The following table reflects the revenue recognized in the reporting periods that were included in contract liabilities from contracts with customers:

(in thousands)

	Three months ended
	March 31, 2021		March 31, 2020
Revenue recognized in the period from amounts included in Billings in Excess of Revenue Earned at the beginning of the period	$	2,189		$	3,762