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Revenue (Tables)
 6 Months Ended
Jun. 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 
   June 30, 2021   June 30, 2020 
   Treatment   Services   Total   Treatment   Services   Total 
Fixed price  $7,706   $1,482   $9,188   $7,840   $2,329   $10,169 
Time and materials   —    6,957    6,957    —    11,878    11,878 
Total  $7,706   $8,439   $16,145   $7,840   $14,207   $22,047 

 

Revenue by Contract Type                    
(In thousands)  Six Months Ended       Six Months Ended     
   June 30, 2021       June 30, 2020     
   Treatment   Services   Total   Treatment   Services   Total 
Fixed price  $15,201   $4,063   $19,264   $17,403   $3,721   $21,124 
Time and materials   —    20,014    20,014    —    25,783    25,783 
Total  $15,201   $24,077   $39,278   $17,403   $29,504   $46,907 

 

Revenue by generator                        
(In thousands)  Three Months Ended       Three Months Ended     
   June 30, 2021       June 30, 2020     
   Treatment   Services   Total   Treatment   Services   Total 
Domestic government  $5,639   $6,764   $12,403   $6,055   $12,791   $18,846 
Domestic commercial   2,060    391    2,451    1,785    431    2,216 
Foreign government   7    1,261    1,268    —    965    965 
Foreign commercial   —    23    23    —    20    20 
Total  $7,706   $8,439   $16,145   $7,840   $14,207   $22,047 

 

Revenue by generator                        
(In thousands)  Six Months Ended   Six Months Ended 
   June 30, 2021   June 30, 2020 
   Treatment   Services   Total   Treatment   Services   Total 
Domestic government  $10,237   $19,425   $29,662   $13,745   $26,589   $40,334 
Domestic commercial   4,328    981    5,309    3,658    893    4,551 
Foreign government   541    3,625    4,166    —    1,979    1,979 
Foreign commercial   95    46    141    —    43    43 
Total  $15,201   $24,077   $39,278   $17,403   $29,504   $46,907 
Schedule of Contract Assets and Liabilities

The following table represents changes in our contract assets and contract liabilities balances:

 

   June 30,   December 31,   Year-to-date   Year-to-date 
(In thousands)  2021   2020   Change ($)   Change (%) 
Contract assets                    
Account receivables, net of allowance  $9,244   $9,659   $(415)   (4.3)%
Unbilled receivables - current   7,332    14,453    (7,121)   (49.3)%
                     
Contract liabilities                    
Deferred revenue  $3,932   $4,614   $(682)   (14.8)%