Revenue (Tables)

6 Months Ended

Jun. 30, 2021

Revenue [Abstract]

Disaggregation of Revenue

The following table represents a disaggregation of revenue by type of goods or services for three and six months ended June 30, 2021 and 2020, along with the reporting segment for each category:

(in thousands)	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Performance Improvement Solutions segment
System Design and Build	$	1,227	$	3,249	$	3,089	$	7,062
Point in time		-		-		-		-
Over time		1,227		3,249		3,089		7,062
Software and Support		766		723		1,579		1,633
Point in time		127		444		222		1,084
Over time		639		279		1,357		549
Training and Consulting Services		4,869		4,300		9,275		9,288
Point in time		16		19		84		48
Over time		4,853		4,281		9,191		9,240
Nuclear Industry Training and Consulting segment
Training and Consulting Services		6,660		6,068		12,683		14,062
Point in time		163		-		249		-
Over time		6,497		6,068		12,434		14,062
Total revenue	$	13,522	$	14,340	$	26,626	$	32,045

Balance of Contract Liabilities and Revenue Recognized in Reporting Period

The following table reflects revenue recognized in the reporting periods presented that was included in contract liabilities from contracts with customers as of the beginning of the periods presented:

(in thousands)	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Revenue recognized in the period from amounts included in billings in excess of revenue earned at the beginning of the period	$	1,115	$	939	$	3,304	$	4,701