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Significant Customers and Contingencies (Detail Narratives)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Number
Dec. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Number of major customers | Number 3      
Accounts receivable $ 829 $ 1,115    
Finished goods inventory $ 1,243 863    
Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Revenue from customers 74.00%      
Customers One [Member]        
Accounts receivable $ 316 $ 6    
Customers One [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Revenue from customers 74.00% 61.00%    
Customers Two [Member]        
Accounts receivable $ 74 $ 1    
Customers Two [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Revenue from customers 7.00% 0.00%    
Customers Three [Member]        
Accounts receivable $ 31 $ 432    
Customers Three [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Revenue from customers 3.00% 11.00%    
BASF [Member]        
Equipment sale - original book value of equipment and upgrades 30.00%      
Equipment sale - net book value equipment 115.00%      
BASF [Member] | Greater than [Member]        
Accelerated debt maturity - principal amount debt $ 10,000      
BASF [Member] | Less than [Member]        
Earnings trigger under supply agreeement 0      
Cash, cash equivalents and investments trigger under supply agreeement $ 500      
Subsequent Event [Member] | BASF [Member] | Greater than [Member]        
Cash, cash equivalents and investments trigger under supply agreeement     $ 1,000  
Finished goods inventory       $ 500