Inventories (Details) - USD ($) $ in Thousands  | 
Sep. 30, 2019  | 
Dec. 31, 2018  | 
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|---|---|---|---|---|---|
| Inventories | |||||
| Work in process | $ 808 | $ 530 | |||
| Finished goods | 373 | 364 | |||
| Total | $ 1,181 | $ 894 | [1] | ||
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| X | ||||||||||
- References No definition available. 
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| X | ||||||||||
- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
- Definition Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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