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Significant Customers and Contingencies (Detail Narrative)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Number
Jun. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of major customers | Number     3      
Accounts receivable $ 1,652   $ 1,652      
Cash, cash equivalents and investments trigger under supply agreeement 500   500      
Finished goods inventory 1,041   1,041     $ 1,243
BASF [Member] | Less than [Member]            
Earnings trigger under supply agreeement     0      
BASF [Member] | Greater than [Member]            
Cash, cash equivalents and investments trigger under supply agreeement 1,000   1,000   $ 1,000  
Accelerated debt maturity - principal amount debt 10,000   10,000      
Finished goods inventory 500   500      
Customers One [Member]            
Accounts receivable 843 $ 927 843 $ 927    
Customers Two [Member]            
Accounts receivable 212 54 212 54    
Customers Three [Member]            
Accounts receivable $ 93 $ 76 $ 93 $ 76    
Customer Concentration Risk [Member] | Revenue Benchmark [Member]            
Revenue from customers       74.00%    
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customers One [Member]            
Revenue from customers 65.00% 66.00% 59.00% 73.00%    
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customers Two [Member]            
Revenue from customers 5.00% 10.00% 12.00% 6.00%    
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customers Three [Member]            
Revenue from customers 4.00% 4.00% 3.00% 3.00%