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Financial Statement Components - Selected Financial Statement Components (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
Inventories: |  |  |
Raw materials and sub-assemblies | $ 23,506 | $ 26,784 |
Work in process | 10,347 | 12,862 |
Finished goods | 4,984 | 8,103 |
Inventories | 38,837 | 47,749 |
Inventories-delivered systems | 2,457 | 2,856 |
Total inventories | 41,294 | 50,605 |
Property, plant and equipment, net: |  |  |
Total property, plant and equipment, gross | 86,545 | 80,561 |
Accumulated depreciation and amortization | (42,319) | (36,068) |
Total property, plant and equipment, net | 44,226 | 44,493 |
Depreciation and amortization expense | 6,800 | 6,900 | $ 6,600
Accrued warranty | 3,838 | 4,504 | $ 2,953
Accrued taxes | 290 | 646 |
Customer deposits | 581 | 290 |
Retrofit liability | 432 |  |
Fair value of current portion of contingent payments to Zygo Corporation related to acquisition |  | 945 |
Accrued professional services | 424 | 481 |
Accrued royalties | 1,233 | 437 |
Other | 1,249 | 1,575 |
Total other current liabilities | 8,047 | 8,878 |
Land [Member] |  |  |
Property, plant and equipment, net: |  |  |
Total property, plant and equipment, gross | 15,568 | 15,569 |
Building and improvements [Member] |  |  |
Property, plant and equipment, net: |  |  |
Total property, plant and equipment, gross | 20,532 | 20,158 |
Machinery and equipment [Member] |  |  |
Property, plant and equipment, net: |  |  |
Total property, plant and equipment, gross | 35,659 | 32,995 |
Furniture and fixtures [Member] |  |  |
Property, plant and equipment, net: |  |  |
Total property, plant and equipment, gross | 2,282 | 2,266 |
Software [Member] |  |  |
Property, plant and equipment, net: |  |  |
Total property, plant and equipment, gross | 9,756 | 8,245 |
Capital in progress [Member] |  |  |
Property, plant and equipment, net: |  |  |
Total property, plant and equipment, gross | $ 2,748 | $ 1,328 |

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