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Financial Statement Components - Selected Financial Statement Components (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 24, 2016 | Sep. 26, 2015 | Sep. 24, 2016 | Sep. 26, 2015 | Jun. 25, 2016 | Dec. 26, 2015 | Jun. 27, 2015 | Dec. 27, 2014
Inventories: |  |  |  |  |  |  |  |
Raw materials and sub-assemblies | $ 21,953 |  | $ 21,953 |  |  | $ 26,784 |  |
Work in process | 9,508 |  | 9,508 |  |  | 12,862 |  |
Finished goods | 7,799 |  | 7,799 |  |  | 8,103 |  |
Inventories | 39,260 |  | 39,260 |  |  | 47,749 |  |
Inventories-delivered systems | 4,416 |  | 4,416 |  |  | 2,856 |  |
Total inventories | 43,676 |  | 43,676 |  |  | 50,605 |  |
Property, plant and equipment, net: |  |  |  |  |  |  |  |
Total property, plant and equipment, gross | 85,645 |  | 85,645 |  |  | 80,561 |  |
Accumulated depreciation and amortization | (41,321) |  | (41,321) |  |  | (36,068) |  |
Total property, plant and equipment, net | 44,324 |  | 44,324 |  |  | 44,493 |  |
Depreciation and amortization expense | 1,700 | $ 1,800 | 5,100 | $ 5,200 |  |  |  |
Accrued warranty | 4,185 | 4,291 | 4,185 | 4,291 | $ 4,556 | 4,504 | $ 3,792 | $ 2,953
Accrued restructuring | 0 | $ 341 | 0 | $ 341 |  | 256 |  | $ 997
Accrued professional services | 492 |  | 492 |  |  | 481 |  |
Accrued royalties | 1,029 |  | 1,029 |  |  | 437 |  |
Fair value of current portion of contingent payments to Zygo Corporation related to acquisition | 814 |  | 814 |  |  | 945 |  |
Other | 2,110 |  | 2,110 |  |  | 2,255 |  |
Total other current liabilities | 8,630 |  | 8,630 |  |  | 8,878 |  |
Land [Member] |  |  |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |  |  |
Total property, plant and equipment, gross | 15,570 |  | 15,570 |  |  | 15,569 |  |
Building and improvements [Member] |  |  |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |  |  |
Total property, plant and equipment, gross | 20,511 |  | 20,511 |  |  | 20,158 |  |
Machinery and equipment [Member] |  |  |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |  |  |
Total property, plant and equipment, gross | 36,109 |  | 36,109 |  |  | 32,995 |  |
Furniture and fixtures [Member] |  |  |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |  |  |
Total property, plant and equipment, gross | 2,357 |  | 2,357 |  |  | 2,266 |  |
Software [Member] |  |  |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |  |  |
Total property, plant and equipment, gross | 9,007 |  | 9,007 |  |  | 8,245 |  |
Capital in progress [Member] |  |  |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |  |  |
Total property, plant and equipment, gross | $ 2,091 |  | $ 2,091 |  |  | $ 1,328 |  |

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