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Consolidated Balance Sheet Detail (Tables) | 12 Months Ended
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Dec. 31, 2018
Inventories | Inventories, net consists of the following:
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  | (Amounts in thousands) |
Raw materials |  | $ | 24,937 |  |  | $ | 22,351 |
Work-in-process |  |  | 5,185 |  |  |  | 4,083 |
Finished products |  |  | 12,141 |  |  |  | 12,570 |
Total inventories, net |  | $ | 42,263 |  |  | $ | 39,004 |
Prepaid Expenses and Other Current Assets | Prepaid expenses and other current assets consist of the following:
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  | (Amounts in thousands) |
Equipment maintenance and services |  | $ | 1,677 |  |  | $ | 1,091 |
Prepaid taxes |  |  | 843 |  |  |  | 311 |
Prepaid insurance |  |  | 629 |  |  |  | 594 |
Deferred costs |  |  | 55 |  |  |  | 67 |
Other |  |  | 697 |  |  |  | 218 |
Total prepaid expenses and other current assets |  | $ | 3,901 |  |  | $ | 2,281 |
Property, Plant and Equipment | Property, plant and equipment consist of the following:
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  | (Amounts in thousands) |
Land |  | $ | 1,023 |  |  | $ | 1,023 |
Buildings |  |  | 764 |  |  |  | 764 |
Leasehold improvements |  |  | 16,259 |  |  |  | 15,673 |
Equipment |  |  | 24,092 |  |  |  | 21,904 |
Furniture and fixtures |  |  | 5,448 |  |  |  | 4,272 |
Construction in progress (1) |  |  | 12,906 |  |  |  | 2,581 |
Total property, plant and equipment |  |  | 60,492 |  |  |  | 46,217 |
Less - Accumulated depreciation |  |  | (28,312 | ) |  |  | (23,800 | )
Total property, plant and equipment, net |  | $ | 32,180 |  |  | $ | 22,417 |
(1) | Construction in progress as of December 31, 2018 includes $7.3 million for the buildout of our Marlborough facility, $2.1 million in capitalized internal-use software development costs and $2.1 million for a casting machine, among other projects.
Accrued Liabilities | Accrued liabilities consist of the following:
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  | (Amounts in thousands) |
Employee compensation |  | $ | 9,953 |  |  | $ | 9,560 |
Taxes |  |  | 1,024 |  |  |  | 1,668 |
Royalty and license fees |  |  | 242 |  |  |  | 1,383 |
Accrued purchases |  |  | 683 |  |  |  | 1,191 |
Warranties |  |  | 546 |  |  |  | 598 |
Professional fees |  |  | 942 |  |  |  | 947 |
Deferred revenue |  |  | 1,290 |  |  |  | 960 |
Other |  |  | 1,185 |  |  |  | 1,622 |
Total accrued liabilities |  | $ | 15,865 |  |  | $ | 17,929 |

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