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Financial Statement Components | 9 Months Ended
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Sep. 26, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Financial Statement Components | Financial Statement Components The following tables provide details of selected financial statement components as of the following dates (in thousands):
Condensed Consolidated Balance Sheets Details | At
| September 26, 2015 |  | December 27, 2014
Inventories: |  |  |
Raw materials and sub-assemblies | $ | 24,999 |  |  | $ | 19,463 |
Work in process | 14,463 |  |  | 7,723 |
Finished goods | 8,936 |  |  | 7,919 |
Inventories | 48,398 |  |  | 35,105 |
Inventories-delivered systems | 1,543 |  |  | 1,912 |
Total inventories | $ | 49,941 |  |  | $ | 37,017 |
Property, plant and equipment, net(1): |  |  |
Land | $ | 15,568 |  |  | $ | 15,572 |
Building and improvements | 19,795 |  |  | 19,641 |
Machinery and equipment | 32,085 |  |  | 29,456 |
Furniture and fixtures | 2,264 |  |  | 2,225 |
Software | 8,094 |  |  | 7,942 |
Capital in progress | 2,414 |  |  | 3,512 |
Total property, plant and equipment, gross | 80,220 |  |  | 78,348 |
Accumulated depreciation and amortization | (34,276 | ) |  | (28,715 | )
Total property, plant and equipment, net | $ | 45,944 |  |  | $ | 49,633 |
(1)Total depreciation and amortization expense for the three months ended September 26, 2015 and September 27, 2014 was $1.8 million and $1.7 million, respectively. Total depreciation and amortization expense for the nine months ended September 26, 2015 and September 27, 2014 was $5.2 million and $4.9 million, respectively. |  |  |
Other current liabilities: |  |  |
Accrued warranty | $ | 4,291 |  |  | $ | 2,953 |
Accrued restructuring | 341 |  |  | 997 |
Accrued professional services | 671 |  |  | 778 |
Fair value of current portion of contingent payments to Zygo Corporation related to acquisition | 1,159 |  |  | 1,385 |
Other | 2,960 |  |  | 2,152 |
Total other current liabilities | $ | 9,422 |  |  | $ | 8,265 |
Components of Accumulated Other Comprehensive Income (Loss)
| Foreign Currency Translations |  | Defined Benefit Pension Plans |  | Unrealized Income (Loss) on Investment |  | Accumulated Other Comprehensive Income
Balance as of December 27, 2014 | $ | (2,604 | ) |  | $ | (134 | ) |  | $ | (31 | ) |  | $ | (2,769 | )
Current period change | (1,980 | ) |  | — |  |  | 42 |  |  | (1,938 | )
Balance as of September 26, 2015 | $ | (4,584 | ) |  | $ | (134 | ) |  | $ | 11 |  |  | $ | (4,707 | )
The items above, except for unrealized income (loss) on investment, did not impact the Company’s income tax provision. The amounts reclassified from each component of accumulated other comprehensive income into income statement line items were insignificant.

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