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Inventories (Tables) | 9 Months Ended
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Sep. 30, 2020
Inventory Disclosure [Abstract] |
Schedule of inventory | Inventories are stated at the lower of standard cost (which approximates actual cost determined using the first-in, first-out cost method) or net realizable value, and consist of the following (in thousands):
| Nine months ended September 30, 2020 |  | Twelve months ended December 31, 2019
Raw materials | $ | 3,625 |  |  | $ | 4,064 |
Finished goods | 5,049 |  |  | 5,749 |
Reserves for excess, obsolete, and slow-moving inventories | (3,415) |  |  | (3,645) |
Inventories, net | $ | 5,259 |  |  | $ | 6,168 |
The following is a roll-forward of the reserves for excess, obsolete, and slow-moving inventories (in thousands):
| Nine months ended September 30, 2020 |  | Twelve months ended December 31, 2019
Beginning balance | $ | (3,645) |  |  | $ | (4,212) |
Accrual | (75) |  |  | (814) |
Reduction due to sold inventory | 288 |  |  | 845 |
Write-off for disposed inventory | 17 |  |  | 536 |
Reserves for excess, obsolete, and slow-moving inventories | $ | (3,415) |  |  | $ | (3,645) |

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