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Financial Statement Components - Selected Financial Statement Components (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Inventories: |  |  |  |  |  |
Raw materials and sub-assemblies | $ 29,880 |  | $ 32,187 |  |  |
Work in process | 17,655 |  | 13,498 |  |  |
Finished goods | 6,703 |  | 7,175 |  |  |
Inventories | 54,238 |  | 52,860 |  |  |
Inventories-delivered systems | 1,855 |  | 1,534 |  |  |
Total inventories | 56,093 |  | 54,394 |  |  |
Property, plant and equipment, net: |  |  |  |  |  |
Total property, plant and equipment, gross | 90,376 |  | 89,229 |  |  |
Accumulated depreciation and amortization | (47,326) |  | (44,419) |  |  |
Total property, plant and equipment, net | 43,050 |  | 44,810 |  |  |
Other Current Liabilities: |  |  |  |  |  |
Accrued warranty | 4,906 | $ 4,643 | 4,863 | $ 4,602 | $ 4,244 | $ 3,838
Accrued taxes | 1,926 |  | 813 |  |  |
Accrued professional services | 496 |  | 534 |  |  |
Other | 1,180 |  | 1,039 |  |  |
Total other current liabilities | 8,508 |  | 7,249 |  |  |
Land [Member] |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |
Total property, plant and equipment, gross | 15,571 |  | 15,573 |  |  |
Building and improvements [Member] |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |
Total property, plant and equipment, gross | 21,195 |  | 20,880 |  |  |
Machinery and equipment [Member] |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |
Total property, plant and equipment, gross | 40,235 |  | 36,380 |  |  |
Furniture and fixtures [Member] |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |
Total property, plant and equipment, gross | 2,461 |  | 2,420 |  |  |
Software [Member] |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |
Total property, plant and equipment, gross | 9,806 |  | 9,558 |  |  |
Capital in progress [Member] |  |  |  |  |  |
Property, plant and equipment, net: |  |  |  |  |  |
Total property, plant and equipment, gross | $ 1,108 |  | $ 4,418 |  |  |

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