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Revenue (Tables) | 6 Months Ended
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Jun. 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 |
|  | June 30, 2018 |  |  | June 30, 2017 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 9,146 |  |  | $ | 718 |  |  | $ | 9,864 |  |  | $ | 9,630 |  |  | $ | 142 |  |  | $ | 9,772 |
Cost reimbursement |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |
Time and materials |  |  | ― |  |  |  | 3,296 |  |  |  | 3,296 |  |  |  | ― |  |  |  | 2,943 |  |  |  | 2,943 |
Total |  | $ | 9,146 |  |  | $ | 4,014 |  |  | $ | 13,160 |  |  | $ | 9,630 |  |  | $ | 3,085 |  |  | $ | 12,715 |
Revenue by Contract Type |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(In thousands) |  | Six Months Ended |  |  | Six Months Ended |
|  | June 30, 2018 |  |  | June 30, 2017 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 18,105 |  |  | $ | 808 |  |  | $ | 18,913 |  |  | $ | 19,665 |  |  | $ | 239 |  |  | $ | 19,904 |
Cost reimbursement |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |  |  |  | ― |
Time and materials |  |  | ― |  |  |  | 6,904 |  |  |  | 6,904 |  |  |  | ― |  |  |  | 5,518 |  |  |  | 5,518 |
Total |  | $ | 18,105 |  |  | $ | 7,712 |  |  | $ | 25,817 |  |  | $ | 19,665 |  |  | $ | 5,757 |  |  | $ | 25,422 |
Revenue by generator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(In thousands) |  | Three Months Ended |  |  | Three Months Ended |
|  | June 30, 2018 |  |  | June 30, 2017 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 6,011 |  |  | $ | 3,265 |  |  | $ | 9,276 |  |  | $ | 7,224 |  |  | $ | 2,474 |  |  | $ | 9,698 |
Domestic commercial |  |  | 3,135 |  |  |  | 541 |  |  |  | 3,676 |  |  |  | 2,406 |  |  |  | 376 |  |  |  | 2,782 |
Foreign government |  |  | ― |  |  |  | 185 |  |  |  | 185 |  |  |  | ― |  |  |  | 214 |  |  |  | 214 |
Foreign commercial |  |  | ― |  |  |  | 23 |  |  |  | 23 |  |  |  | ― |  |  |  | 21 |  |  |  | 21 |
Total |  | $ | 9,146 |  |  | $ | 4,014 |  |  | $ | 13,160 |  |  | $ | 9,630 |  |  | $ | 3,085 |  |  | $ | 12,715 |
Revenue by generator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(In thousands) |  | Six Months Ended |  |  | Six Months Ended |
|  | June 30, 2018 |  |  | June 30, 2017 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 12,546 |  |  | $ | 6,383 |  |  | $ | 18,929 |  |  | $ | 14,595 |  |  | $ | 4,542 |  |  | $ | 19,137 |
Domestic commercial |  |  | 5,559 |  |  |  | 943 |  |  |  | 6,502 |  |  |  | 5,070 |  |  |  | 895 |  |  |  | 5,965 |
Foreign government |  |  | ― |  |  |  | 338 |  |  |  | 338 |  |  |  | ― |  |  |  | 279 |  |  |  | 279 |
Foreign commercial |  |  | ― |  |  |  | 48 |  |  |  | 48 |  |  |  | ― |  |  |  | 41 |  |  |  | 41 |
Total |  | $ | 18,105 |  |  | $ | 7,712 |  |  | $ | 25,817 |  |  | $ | 19,665 |  |  | $ | 5,757 |  |  | $ | 25,422 |
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) |  | June 30, 2018 |  |  | January 1, 2018 |  |  | Change ($) |  |  | Change (%) |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Account receivables, net of allowance |  | $ | 6,075 |  |  | $ | 7,940 |  |  | $ | (1,865 | ) |  |  | (23.5 | )%
Unbilled receivables - current |  |  | 3,018 |  |  |  | 4,547 |  |  |  | (1,529 | ) |  |  | (33.6 | )%
Unbilled receivables - non-current |  |  | 129 |  |  |  | 184 |  |  |  | (55 | ) |  |  | (29.9 | )%
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  | $ | 4,472 |  |  | $ | 5,083 |  |  | $ | (611 | ) |  |  | (12.0 | )%

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