Revenue (Tables)

3 Months Ended

Mar. 31, 2024

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

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

Schedule of 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	%