| Organization and Summary of Significant Accounting Policies - Components of Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | 
|---|---|---|
| Organization and Summary of Significant Accounting Policies | ||
| Raw materials and supplies | $ 532 | $ 563 | 
| Finished goods | 437 | 435 | 
| Total inventories | $ 969 | $ 998 | 
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- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- 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 | ||||||||||
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- Definition Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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