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Inventory (Tables) | 12 Months Ended
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Dec. 31, 2020
Inventory Disclosure [Abstract] |
Schedule of Inventory | Our inventory, net of allowance for obsolescence of $221,000 and $24,000 at December 31, 2020 and 2019, respectively, consisted of the following:
| December 31,
| 2020 |  | 2019
| (in thousands)
Raw materials - current | $ | 18,026 |  |  | $ | 19,388 |
Work-in-process | 1,900 |  |  | 1,692 |
Finished goods | — |  |  | — |
Inventory - current | 19,926 |  |  | 21,080 |
Raw materials - long term (net of allowances of $221 and $24, respectively) | 1,065 |  |  | 1,068 |
Inventory - total | $ | 20,991 |  |  | $ | 22,148 |
A summary of our inventory allowance is as follows:
| Year Ended December 31,
| 2020 |  | 2019
| (in thousands)
Beginning balance | $ | (24) |  |  | $ | (19) |
Accruals | (251) |  |  | (3,758) |
Write-offs | 54 |  |  | 3,753 |
Ending balance | (221) |  |  | (24) |

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