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Revenue | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Revenue | NOTE 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 following tables present further disaggregation of our revenues by different categories for our Services and Treatment Segments:
Revenue by Contract Type |  |  |  |  |  |
(In thousands) |  | Twelve Months Ended |  |  | Tweleve Months Ended |
|  | December 31, 2018 |  |  | December 31, 2017 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 36,271 |  |  | $ | 1,575 |  |  | $ | 37,846 |  |  | $ | 37,750 |  |  | $ | 714 |  |  | $ | 38,464 |
Time and materials |  |  | ― |  |  |  | 11,693 |  |  |  | 11,693 |  |  |  | ― |  |  |  | 11,305 |  |  |  | 11,305 |
Total |  | $ | 36,271 |  |  | $ | 13,268 |  |  | $ | 49,539 |  |  | $ | 37,750 |  |  | $ | 12,019 |  |  | $ | 49,769 |
Revenue by generator |  |  |  |  |  |
(In thousands) |  | Twelve Months Ended |  |  | Twelve Months Ended |
|  | December 31, 2018 |  |  | December 31, 2017 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 25,181 |  |  | $ | 9,630 |  |  | $ | 34,811 |  |  | $ | 27,956 |  |  | $ | 9,063 |  |  | $ | 37,019 |
Domestic commercial |  |  | 10,970 |  |  |  | 2,521 |  |  |  | 13,491 |  |  |  | 9,794 |  |  |  | 1,800 |  |  |  | 11,594 |
Foreign government |  |  | 114 |  |  |  | 1,019 |  |  |  | 1,133 |  |  |  | ― |  |  |  | 1,073 |  |  |  | 1,073 |
Foreign commercial |  |  | 6 |  |  |  | 98 |  |  |  | 104 |  |  |  | ― |  |  |  | 83 |  |  |  | 83 |
Total |  | $ | 36,271 |  |  | $ | 13,268 |  |  | $ | 49,539 |  |  | $ | 37,750 |  |  | $ | 12,019 |  |  | $ | 49,769 |
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:
(In thousands) |  | December 31, 2018 |  |  | January 1, 2018 |  |  | Year-to-date Change ($) |  |  | Year-to-date Change (%) |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Account receivables, net of allowance |  | $ | 7,735 |  |  | $ | 7,940 |  |  | $ | (205 | ) |  |  | (2.6 | )%
Unbilled receivables - current |  |  | 3,105 |  |  |  | 4,547 |  |  |  | (1,442 | ) |  |  | (31.7 | )%
Unbilled receivables - non-current |  |  | ― |  |  |  | 184 |  |  |  | (184 | ) |  |  | (100.0 | )%
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  | $ | 6,595 |  |  | $ | 5,083 |  |  | $ | 1,512 |  |  |  | 29.7 | %
During the twelve months ended December 31, 2018 and 2017, the Company recognized revenue of $8,071,000 and $5,105,000, respectively, which was included in the deferred revenue balance at the beginning of the year. Revenue recognized in each period related to performance obligations satisfied within the respective period.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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