XML 74 R60.htm IDEA: XBRL DOCUMENT v3.21.2
Commitments and Contingencies - Narrative (Detail)
MMBTU in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2019
Jul. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Aug. 31, 2015
USD ($)
May 31, 2019
MMBTU
May 31, 2018
USD ($)
Jun. 30, 2011
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Other Commitments [Line Items]                        
Rental expense                 $ 100,000 $ 100,000    
Property, plant, and equipment, net                 49,951,000   $ 49,951,000 $ 45,104,000
License payment, royalty payment                 0      
Operating and Maintenance Agreement                        
Other Commitments [Line Items]                        
Service agreement, periods             5 years          
Operating and maintenance agreements, automatic extension periods             1 year          
Property, plant, and equipment, net                 100,000 100,000 100,000  
Operating and Maintenance Agreement | Minimum                        
Other Commitments [Line Items]                        
Operating and maintenance agreements, fixed payments per year             $ 400,000          
Take Or Pay Steam Supply Agreement                        
Other Commitments [Line Items]                        
Property, plant, and equipment, net                 100,000 100,000 $ 100,000  
Service agreement, percentage of steam receivable thereafter 50.00%                      
Take Or Pay Steam Supply Agreement | Maximum                        
Other Commitments [Line Items]                        
Service agreement, percentage of steam receivable during first year 25.00%                      
Service agreement, MMBtus per year generated | MMBTU | MMBTU           140            
Joint Development Agreements                        
Other Commitments [Line Items]                        
Service agreement, periods                     3 years  
Property, plant, and equipment, net                 0 0 $ 0  
Patent License Agreement                        
Other Commitments [Line Items]                        
License agreement amount   $ 100,000 $ 500,000 $ 35,000                
Royalty payment per year   5,000   25,000                
Royalty payment, cumulative amount     500,000   $ 10,000,000              
Upfront license fee royalty and a variable royalty, aggregate cap per facility     $ 10,000,000                  
License payment, royalty payment                 $ 0 $ 0    
Patent License Agreement | Maximum                        
Other Commitments [Line Items]                        
Royalty payment per year   $ 25,000                    
Royalty payment, cumulative amount       $ 1,000,000 $ 2,000,000              
Nonexclusive Patents Llicense Agreement                        
Other Commitments [Line Items]                        
Royalty payment per year               $ 5,000        
Percentage of net sales               0.40%