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Revenue (Tables) | 12 Months Ended
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Dec. 31, 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) |  | 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 |
Schedule of Contract Assets and Liabilities | 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 | %

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