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Financial Statement Components (Tables) | 12 Months Ended
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Dec. 27, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Selected balance sheet components |
Consolidated Balance Sheets |  |  |
| At
| December 27, 2014 |  | December 28, 2013
Inventories: |  |  |
Raw materials and sub-assemblies | $ | 19,463 |  |  | $ | 19,655 |
Work in process | 7,723 |  |  | 7,597 |
Finished goods | 7,919 |  |  | 7,268 |
Inventories | 35,105 |  |  | 34,520 |
Inventories-delivered systems | 1,912 |  |  | 6,901 |
Total inventories | $ | 37,017 |  |  | $ | 41,421 |
Property, plant and equipment, net(1): |  |  |
Land | $ | 15,572 |  |  | $ | 15,569 |
Building and improvements | 19,641 |  |  | 19,403 |
Machinery and equipment | 29,456 |  |  | 27,820 |
Furniture and fixtures | 2,225 |  |  | 2,308 |
Software | 7,942 |  |  | 1,851 |
Capital in progress | 3,512 |  |  | 5,833 |
Total property, plant and equipment, gross | 78,348 |  |  | 72,784 |
Accumulated depreciation and amortization | (28,715 | ) |  | (25,345 | )
Total property, plant and equipment, net | $ | 49,633 |  |  | $ | 47,439 |
(1)Total depreciation and amortization expense for the years ended December 27, 2014, December 28, 2013, and December 29, 2012 was $6.6 million, $5.4 million, and $4.8 million, respectively. |  |  |
Other current liabilities: |  |  |
Accrued warranty | $ | 2,953 |  |  | $ | 3,426 |
Accrued restructuring | 997 |  |  | — |
Accrued professional services | 778 |  |  | 545 |
Fair value of current portion of contingent payments to Zygo Corporation related to acquisition | 1,385 |  |  | 1,344 |
Other | 2,152 |  |  | 2,678 |
Total other current liabilities | $ | 8,265 |  |  | $ | 7,993 |
Components of accumulated other comprehensive income (loss) | Components of Accumulated Other Comprehensive Income (Loss)
| Years Ended
| Foreign Currency Translations |  | Defined Benefit Pension Plans |  | Unrealized Income (Loss) on Investment |  | Accumulated Other Comprehensive Income
Balance as of December 29, 2012 | $ | 1,453 |  |  | $ | (179 | ) |  | $ | (2 | ) |  | $ | 1,272 |
Current period change | (818 | ) |  | 151 |  |  | 7 |  |  | (660 | )
Balance as of December 28, 2013 | 635 |  |  | (28 | ) |  | 5 |  |  | 612 |
Current period change | (3,239 | ) |  | (106 | ) |  | (36 | ) |  | (3,381 | )
Balance as of December 27, 2014 | $ | (2,604 | ) |  | $ | (134 | ) |  | $ | (31 | ) |  | $ | (2,769 | )
The items above, except for unrealized income (loss) on investment, did not impact the Company’s income tax provision.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations. + References No definition available. + Details
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