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Revenue

6 Months Ended

Jun. 30, 2019

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 result 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
		June 30, 2019												June 30, 2018
		Treatment				Services				Total				Treatment				Services				Total
Fixed price		$	10,094			$	2,709			$	12,803			$	9,146			$	718			$	9,864
Time and materials			―				4,332				4,332				―				3,296				3,296
Total		$	10,094			$	7,041			$	17,135			$	9,146			$	4,014			$	13,160

Revenue by Contract Type
(In thousands)		Six Months Ended												Six Months Ended
		June 30, 2019												June 30, 2018
		Treatment				Services				Total				Treatment				Services				Total
Fixed price		$	19,999			$	3,137			$	23,136			$	18,105			$	808			$	18,913
Time and materials			―				5,707				5,707				―				6,904				6,904
Total		$	19,999			$	8,844			$	28,843			$	18,105			$	7,712			$	25,817

Revenue by generator
(In thousands)		Three Months Ended												Three Months Ended
		June 30, 2019												June 30, 2018
		Treatment				Services				Total				Treatment				Services				Total
Domestic government		$	6,537			$	4,842			$	11,379			$	6,011			$	3,265			$	9,276
Domestic commercial			3,395				855				4,250				3,135				541				3,676
Foreign government			162				1,323				1,485				―				185				185
Foreign commercial			―				21				21				―				23				23
Total		$	10,094			$	7,041			$	17,135			$	9,146			$	4,014			$	13,160

Revenue by generator
(In thousands)		Six Months Ended												Six Months Ended
		June 30, 2019												June 30, 2018
		Treatment				Services				Total				Treatment				Services				Total
Domestic government		$	14,449			$	5,529			$	19,978			$	12,546			$	6,383			$	18,929
Domestic commercial			5,274				1,613				6,887				5,559				943				6,502
Foreign government			220				1,659				1,879				―				338				338
Foreign commercial			56				43				99				―				48				48
Total		$	19,999			$	8,844			$	28,843			$	18,105			$	7,712			$	25,817

Contract Balances

The timing of revenue recognition, billings, and cash collections results in accounts receivable and unbilled receivables (contract assets). The Company’s contract liabilities consist of deferred revenues which represents advance payment from customers in advance of the completion of our performance obligation.

The following table represents changes in our contract assets and contract liabilities balances:

										Year-to-date				Year-to-date
(In thousands)		June 30, 2019				December 31, 2018				Change ($)				Change (%)
Contract assets
Account receivables, net of allowance		$	7,747			$	7,735			$	12				0.2	%
Unbilled receivables - current			6,158				3,105				3,053				98.3	%

Contract liabilities
Deferred revenue		$	4,785			$	6,595			$	(1,810	)			(27.4	)%

During the three and six months ended June 30, 2019, the Company recognized revenue of $2,866,000 and $7,446,000, respectively, which was included in the deferred revenue balance at the beginning of the year. During the three and six months ended June 30, 2018, the Company recognized revenue of $1,629,000 and $5,440,000, respectively, which was included in the deferred revenue balance at the beginning of the year. All revenue recognized in each period related to performance obligations satisfied within the respective period.

Remaining Performance Obligations

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