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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2018
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | 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 |
|  | September 30, 2018 |  |  | September 30, 2017 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 9,103 |  |  | $ | 304 |  |  | $ | 9,407 |  |  | $ | 9,355 |  |  | $ | 383 |  |  | $ | 9,738 |
Cost reimbursement |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |
Time and materials |  |  | ― |  |  |  | 2,577 |  |  |  | 2,577 |  |  |  | ― |  |  |  | 2,020 |  |  |  | 2,020 |
Total |  | $ | 9,103 |  |  | $ | 2,881 |  |  | $ | 11,984 |  |  | $ | 9,355 |  |  | $ | 2,403 |  |  | $ | 11,758 |
Revenue by Contract Type
(In thousands) |  | Nine Months Ended |  |  | Nine Months Ended |
|  | September 30, 2018 |  |  | September 30, 2017 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 27,207 |  |  | $ | 1,040 |  |  | $ | 28,247 |  |  | $ | 29,019 |  |  | $ | 623 |  |  | $ | 29,642 |
Cost reimbursement |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |
Time and materials |  |  | ― |  |  |  | 9,554 |  |  |  | 9,554 |  |  |  | ― |  |  |  | 7,537 |  |  |  | 7,537 |
Total |  | $ | 27,207 |  |  | $ | 10,594 |  |  | $ | 37,801 |  |  | $ | 29,019 |  |  | $ | 8,160 |  |  | $ | 37,179 |
Revenue by generator |  |  |
(In thousands) |  | Three Months Ended |  |  | Three Months Ended |
|  | September 30, 2018 |  |  | September 30, 2017 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 6,552 |  |  | $ | 1,848 |  |  | $ | 8,400 |  |  | $ | 7,170 |  |  | $ | 1,376 |  |  | $ | 8,546 |
Domestic commercial |  |  | 2,437 |  |  |  | 718 |  |  |  | 3,155 |  |  |  | 2,185 |  |  |  | 523 |  |  |  | 2,708 |
Foreign government |  |  | 114 |  |  |  | 294 |  |  |  | 408 |  |  |  | ― |  |  |  | 483 |  |  |  | 483 |
Foreign commercial |  |  | ― |  |  |  | 21 |  |  |  | 21 |  |  |  | ― |  |  |  | 21 |  |  |  | 21 |
Total |  | $ | 9,103 |  |  | $ | 2,881 |  |  | $ | 11,984 |  |  | $ | 9,355 |  |  | $ | 2,403 |  |  | $ | 11,758 |
Revenue by generator |  |  |
(In thousands) |  | Nine Months Ended |  |  | Nine Months Ended |
|  | September 30, 2018 |  |  | September 30, 2017 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 19,098 |  |  | $ | 8,231 |  |  | $ | 27,329 |  |  | $ | 21,764 |  |  | $ | 5,919 |  |  | $ | 27,683 |
Domestic commercial |  |  | 7,995 |  |  |  | 1,661 |  |  |  | 9,656 |  |  |  | 7,255 |  |  |  | 1,417 |  |  |  | 8,672 |
Foreign government |  |  | 114 |  |  |  | 632 |  |  |  | 746 |  |  |  | ― |  |  |  | 762 |  |  |  | 762 |
Foreign commercial |  |  | ― |  |  |  | 70 |  |  |  | 70 |  |  |  | ― |  |  |  | 62 |  |  |  | 62 |
Total |  | $ | 27,207 |  |  | $ | 10,594 |  |  | $ | 37,801 |  |  | $ | 29,019 |  |  | $ | 8,160 |  |  | $ | 37,179 |
Schedule of Contract Assets and Liabilities | The following table represents changes in our contract assets and contract liabilities balances:
|  |  |  |  |  |  |  | Year-to-date |  |  | Year-to-date |
(In thousands) |  | September 30, 2018 |  |  | January 1, 2018 |  |  | Change ($) |  |  | Change (%) |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Account receivables, net of allowance |  | $ | 8,300 |  |  | $ | 7,940 |  |  | $ | 360 |  |  |  | 4.5 | %
Unbilled receivables - current |  |  | 3,389 |  |  |  | 4,547 |  |  |  | (1,158 | ) |  |  | (25.5 | )%
Unbilled receivables - non-current |  |  | ― |  |  |  | 184 |  |  |  | (184 | ) |  |  | (100.0 | )%
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  | $ | 5,872 |  |  | $ | 5,083 |  |  | $ | 789 |  |  |  | 15.5 | %

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