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Significant Customers (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Net sales $ 1,651 $ 3,186 $ 3,969 $ 6,594  
Sales Revenue, Net [Member] | Third Party Contract Manufacturing Customer One [Member]          
Concentration risk, percentage 67.20% 57.20% 54.80% 43.10%  
Sales Revenue, Net [Member] | Third Party Contract Manufacturing Customer Two [Member]          
Concentration risk, percentage 21.20% 29.40% 22.80% 39.00%  
Accounts Receivable [Member] | Customer One [Member]          
Concentration risk, percentage     45.00%   82.00%
Accounts Receivable [Member] | Customer Two [Member]          
Concentration risk, percentage     39.00%   82.00%