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Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 05, 2015 | Jun. 29, 2014 | Jul. 05, 2015 | Jun. 29, 2014 | Dec. 31, 2014
Assets and Liabilities |  |  |  |  |
Held for sale assets | $ 38,927 |  | $ 38,927 |  | $ 29,814
Held for sale liabilities | 14,598 |  | 14,598 |  | 12,191
Revenue and Expenses |  |  |  |  |
Income from discontinued operations, net | 198 | $ 3,273 | 1,228 | $ 3,963 |
Significant Noncash Items |  |  |  |  |
Capital expenditures |  |  | 482 | 261 |
SISD | Discontinued Operations, Held-for-sale |  |  |  |  |
Assets and Liabilities |  |  |  |  |
Accounts receivable, net | 9,550 |  | 9,550 |  | 10,885
Inventories, net | 5,943 |  | 5,943 |  | 6,313
Unbilled revenue | 2,573 |  | 2,573 |  | 2,356
Prepaid expenses and other current assets | 3,391 |  | 3,391 |  | 2,955
Property, plant, and equipment, net | 1,720 |  | 1,720 |  | 1,944
Intangible assets, net | 11,338 |  | 11,338 |  | 1,029
Goodwill | 4,301 |  | 4,301 |  | 4,301
Other assets | 111 |  | 111 |  | 31
Held for sale assets | 38,927 |  | 38,927 |  | 29,814
Accounts payable | 1,470 |  | 1,470 |  | 1,891
Accrued expenses | 3,787 |  | 3,787 |  | 4,335
Deferred revenue | 9,341 |  | 9,341 |  | 5,965
Held for sale liabilities | 14,598 |  | 14,598 |  | $ 12,191
Revenue and Expenses |  |  |  |  |
Revenue | 11,187 | 16,526 | 23,248 | 26,139 |
Cost of revenue | (5,765) | (7,506) | (11,291) | (11,948) |
Research, development, and engineering expenses | 1,022 | 1,118 | 2,126 | 2,068 |
Selling, general, and administrative expenses | (4,176) | (3,204) | (7,800) | (6,384) |
Foreign currency gain (loss) | 77 | (22) | (177) | (22) |
Pretax income from discontinued operations | 301 | 4,676 | 1,854 | 5,717 |
Income tax expense | 103 | 1,403 | 626 | 1,754 |
Income from discontinued operations, net | 198 | 3,273 | 1,228 | 3,963 |
Significant Noncash Items |  |  |  |  |
Capital expenditures | 171 | 152 | 482 | 261 |
Stock-based compensation expense | 144 | 248 | 427 | 555 |
Depreciation expense | 203 | 193 | 401 | 388 |
Amortization expense | $ 82 | $ 94 | $ 165 | $ 188 |

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