Revenue (Tables)

6 Months Ended

Jun. 30, 2024

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

Revenue by Contract Type
(In thousands)	Three Months Ended						Three Months Ended
	June 30, 2024						June 30, 2023
	Treatment		Services		Total		Treatment		Services		Total
Fixed price	$	8,343	$	4,755	$	13,098	$	12,834	$	11,161	$	23,995
Time and materials		—		888		888		—		1,037		1,037
Total	$	8,343	$	5,643	$	13,986	$	12,834	$	12,198	$	25,032

Revenue by Contract Type
(In thousands)	Six Months Ended						Six Months Ended
	June 30, 2024						June 30, 2023
	Treatment		Services		Total		Treatment		Services		Total
Fixed price	$	17,052	$	9,069	$	26,121	$	22,428	$	19,808	$	42,236
Time and materials		—		1,482		1,482		—		2,903		2,903
Total	$	17,052	$	10,551	$	27,603	$	22,428	$	22,711	$	45,139

Revenue by generator
(In thousands)	Three Months Ended						Three Months Ended
	June 30, 2024						June 30, 2023
	Treatment		Services		Total		Treatment		Services			Total
Domestic government	$	6,252	$	4,168	$	10,420	$	9,808	$	11,441		$	21,249
Domestic commercial		1,721		1,363		3,084		2,269		742			3,011
Foreign government		1		88		89		657		(7	)		650
Foreign commercial		369		24		393		100		22			122
Total	$	8,343	$	5,643	$	13,986	$	12,834	$	12,198		$	25,032

Revenue by generator
(In thousands)	Six Months Ended						Six Months Ended
	June 30, 2024						June 30, 2023
	Treatment		Services		Total		Treatment		Services		Total
Domestic government	$	12,013	$	8,471	$	20,484	$	17,065	$	21,159	$	38,224
Domestic commercial		4,222		1,867		6,089		4,475		1,339		5,814
Foreign government		1		167		168		752		170		922
Foreign commercial		816		46		862		136		43		179
Total	$	17,052	$	10,551	$	27,603	$	22,428	$	22,711	$	45,139

Schedule of Contract Balances

(In thousands)	June 30, 2024		December 31, 2023		Change ($)			Change (%)
Contract assets
Unbilled receivables - current	$	7,076	$	8,432	$	(1,356	)		-16	%
Contract liabilities
Deferred revenue	$	5,818	$	6,815	$	(997	)		-14.6	%