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Revenue (Tables)
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of 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 nature of the Company’s performance obligations within our Treatment and Services Segments result in the recognition of our revenue primarily over time. 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, 2021   September 30, 2020 
   Treatment   Services   Total   Treatment   Services   Total 
Fixed price  $8,893   $3,031   $11,924   $7,066   $2,372   $9,438 
Time and materials   —    3,873    3,873    —    20,734    20,734 
Total  $8,893   $6,904   $15,797   $7,066   $23,106   $30,172 

 

Revenue by Contract Type                    
(In thousands)  Nine Months Ended   Nine Months Ended 
   September 30, 2021   September 30, 2020 
   Treatment   Services   Total   Treatment   Services   Total 
Fixed price  $24,094   $7,094   $31,188   $24,469   $6,093   $30,562 
Time and materials   —    23,887    23,887    —    46,517    46,517 
Total  $24,094   $30,981   $55,075   $24,469   $52,610   $77,079 

 

Revenue by generator                        
(In thousands)  Three Months Ended   Three Months Ended 
   September 30, 2021   September 30, 2020 
   Treatment   Services   Total   Treatment   Services   Total 
Domestic government  $6,725   $4,552   $11,277   $5,334   $21,660   $26,994 
Domestic commercial   1,956    399    2,355    1,598    459    2,057 
Foreign government   36    1,931    1,967    134    966    1,100 
Foreign commercial   176    22    198     —    21    21 
Total  $8,893   $6,904   $15,797   $7,066   $23,106   $30,172 

 

Revenue by generator                        
(In thousands)  Nine Months Ended   Nine Months Ended 
   September 30, 2021   September 30, 2020 
   Treatment   Services   Total   Treatment   Services   Total 
Domestic government  $16,962   $24,172   $41,134   $19,079   $48,249   $67,328 
Domestic commercial   6,284    1,185    7,469    5,256    1,352    6,608 
Foreign government   577    5,556    6,133    134    2,945    3,079 
Foreign commercial   271    68    339     —    64    64 
Total  $24,094   $30,981   $55,075   $24,469   $52,610   $77,079 
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, 2021   December 31, 2020   Change ($)   Change (%) 
Contract assets                    
Account receivables, net of allowance  $11,816   $9,659   $2,157    22.3%
Unbilled receivables - current   5,696    14,453    (8,757)   (60.6)%
                     
Contract liabilities                    
Deferred revenue  $3,435   $4,614   $(1,179)   (25.6)%