Revenue

3 Months Ended

Mar. 31, 2024

Revenue from Contract with Customer [Abstract]

Revenue

3. Revenue

Disaggregation of Revenue

In general, the Company’s business segmentation is aligned according to the nature and economic characteristics of our services and provides meaningful disaggregation of each business segment’s results of operations. The nature of the Company’s performance obligations within our Treatment and Services Segments results in the recognition of our revenue primarily over time. The following tables present further disaggregation of our revenues by different categories for our Services and Treatment Segments:

Revenue by Contract Type

(In thousands)	Three Months Ended						Three Months Ended
	March 31, 2024						March 31, 2023
	Treatment		Services		Total		Treatment		Services		Total
Fixed price	$	8,709	$	4,314	$	13,023	$	9,594	$	8,647	$	18,241
Time and materials		—		594		594		—		1,866		1,866
Total	$	8,709	$	4,908	$	13,617	$	9,594	$	10,513	$	20,107

Revenue by generator

(In thousands)	Three Months Ended						Three Months Ended
	March 31, 2024						March 31, 2023
	Treatment		Services		Total		Treatment		Services		Total
Domestic government	$	5,761	$	4,303	$	10,064	$	7,257	$	9,718	$	16,975
Domestic commercial		2,501		504		3,005		2,206		597		2,803
Foreign government		—		79		79		95		177		272
Foreign commercial		447		22		469		36		21		57
Total	$	8,709	$	4,908	$	13,617	$	9,594	$	10,513	$	20,107

Contract Balances

The timing of revenue recognition and billings results in unbilled receivables (contract assets). The Company’s contract liabilities consist of deferred revenues which represent advance payment from customers in advance of the completion of our performance obligation. The following table represents changes in our contract asset and contract liabilities balances:

					Year-to-date		Year-to-date
(In thousands)	March 31, 2024		December 31, 2023		Change ($)		Change (%)
Contract assets
Unbilled receivables - current	$	8,797	$	8,432	$	365		4.3	%
Contract liabilities
Deferred revenue	$	7,295	$	6,815	$	480		7.0	%

During the three months ended March 31, 2024, and 2023, the Company recognized revenue of $3,165,000 and $3,494,000, respectively, related to untreated waste that was in the Company’s control as of the beginning of each respective year. Revenue recognized in each period relates to performance obligations satisfied within the respective period.

Remaining Performance Obligations

The Company applies the practical expedient in ASC 606-10-50-14 and does not disclose information about remaining performance obligations that have original expected durations of one year or less.

Within our Services Segment, there are service contracts which provide that the Company has a right to consideration from a customer in an amount that corresponds directly with the value to the customer of our performance completed to date. For those contracts, the Company has utilized the practical expedient in ASC 606-10-55-18, which allows the Company to recognize revenue in the amount for which we have the right to invoice; accordingly, the Company does not disclose the value of remaining performance obligations for those contracts.

The Company’s contracts and subcontracts relating to activities at governmental sites generally allow for termination for convenience at any time at the government’s option without payment of a substantial penalty. The Company does not disclose remaining performance obligations on these contracts.