| Schedule of Disaggregation of Revenue | 
 Revenue by Contract Type 
(In thousands) 
  
    |   | 
      | 
    Three Months Ended | 
      | 
      | 
    Three Months Ended | 
      | 
 
    |   | 
      | 
    March 31, 2020 | 
      | 
      | 
    March 31, 2019 | 
      | 
 
    |   | 
      | 
    Treatment | 
      | 
      | 
    Services | 
      | 
      | 
    Total | 
      | 
      | 
    Treatment | 
      | 
      | 
    Services | 
      | 
      | 
    Total | 
      | 
 
    | Fixed price | 
      | 
    $ | 
    9,563 | 
      | 
      | 
    $ | 
    2,947 | 
      | 
      | 
    $ | 
    12,510 | 
      | 
      | 
    $ | 
    9,905 | 
      | 
      | 
    $ | 
    428 | 
      | 
      | 
    $ | 
    10,333 | 
      | 
 
    | Time and materials | 
      | 
      | 
     ― | 
      | 
      | 
      | 
    12,350 | 
      | 
      | 
      | 
    12,350 | 
      | 
      | 
      | 
     ― | 
      | 
      | 
      | 
    1,375 | 
      | 
      | 
      | 
    1,375 | 
      | 
 
    | Total | 
      | 
    $ | 
    9,563 | 
      | 
      | 
    $ | 
    15,297 | 
      | 
      | 
    $ | 
    24,860 | 
      | 
      | 
    $ | 
    9,905 | 
      | 
      | 
    $ | 
    1,803 | 
      | 
      | 
    $ | 
    11,708 | 
      | 
 
 
  
Revenue by generator 
(In thousands) 
  
    |   | 
      | 
    Three Months Ended | 
      | 
      | 
    Three Months Ended | 
      | 
 
    |   | 
      | 
    March 31, 2020 | 
      | 
      | 
    March 31, 2019 | 
      | 
 
    |   | 
      | 
    Treatment | 
      | 
      | 
    Services | 
      | 
      | 
    Total | 
      | 
      | 
    Treatment | 
      | 
      | 
    Services | 
      | 
      | 
    Total | 
      | 
 
    | Domestic government | 
      | 
    $ | 
    7,690 | 
      | 
      | 
    $ | 
    13,798 | 
      | 
      | 
    $ | 
    21,488 | 
      | 
      | 
    $ | 
    7,913 | 
      | 
      | 
    $ | 
    686 | 
      | 
      | 
    $ | 
    8,599 | 
      | 
 
    | Domestic commercial | 
      | 
      | 
    1,873 | 
      | 
      | 
      | 
    462 | 
      | 
      | 
      | 
    2,335 | 
      | 
      | 
      | 
    1,879 | 
      | 
      | 
      | 
    758 | 
      | 
      | 
      | 
    2,637 | 
      | 
 
    | Foreign government | 
      | 
      | 
     ― | 
      | 
      | 
      | 
    1,014 | 
      | 
      | 
      | 
    1,014 | 
      | 
      | 
      | 
    57 | 
      | 
      | 
      | 
    337 | 
      | 
      | 
      | 
    394 | 
      | 
 
    | Foreign commercial | 
      | 
      | 
     ― | 
      | 
      | 
      | 
    23 | 
      | 
      | 
      | 
    23 | 
      | 
      | 
      | 
    56 | 
      | 
      | 
      | 
    22 | 
      | 
      | 
      | 
    78 | 
      | 
 
    | Total | 
      | 
    $ | 
    9,563 | 
      | 
      | 
    $ | 
    15,297 | 
      | 
      | 
    $ | 
    24,860 | 
      | 
      | 
    $ | 
    9,905 | 
      | 
      | 
    $ | 
    1,803 | 
      | 
      | 
    $ | 
    11,708 | 
      | 
 
 
 | 
| Schedule of Contract Assets and Liabilities | 
 The following table represents
changes in our contract assets and contract liabilities balances: 
  
    | (In thousands) | 
      | 
    March 31, 2020 | 
      | 
      | 
    December 31, 2019 | 
      | 
      | 
    Year-to-date 
Change ($) | 
      | 
      | 
    Year-to-date 
Change (%) | 
      | 
 
    | Contract assets | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Account receivables, net of allowance | 
      | 
    $ | 
    10,226 | 
      | 
      | 
    $ | 
    13,178 | 
      | 
      | 
    $ | 
    (2,952 | 
    ) | 
      | 
      | 
    (22.4 | 
    )% | 
 
    | Unbilled receivables - current | 
      | 
      | 
    10,188 | 
      | 
      | 
      | 
    7,984 | 
      | 
      | 
      | 
    2,204 | 
      | 
      | 
      | 
    27.6 | 
    % | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Contract liabilities | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Deferred revenue | 
      | 
    $ | 
    5,944 | 
      | 
      | 
    $ | 
    5,456 | 
      | 
      | 
    $ | 
    488 | 
      | 
      | 
      | 
    8.9 | 
    % | 
 
 
 |