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General - Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Jul. 06, 2020
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Jan. 28, 2020
USD ($)
Nov. 30, 2016
USD ($)
Sep. 26, 2020
USD ($)
Patents
shares
Dec. 31, 2019
shares
Number of patents generated | Patents         100  
Research and development program award from U.S. Department of energy (DOE)       $ 4.5    
Percentage of Cost Reduction Employee Workforce     70.00%      
Expected aggregate sale value     $ 1.2      
Common stock issued | shares         3,151,780 1,773,189
Cmmon stock ,Value $ 1.6          
Securities Purchase Agreement [Member]            
Common stock issued | shares   400,000        
Cmmon stock ,Value   $ 1.6        
Common Stock purchase price | $ / shares   $ 4.00        
Merger Agreement [Member] | Minimum [Member]            
Net working capital         $ 250,000.0