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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

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