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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jul. 01, 2017
Accounting Policies [Abstract] |
Property, Plant and Equipment | Property and equipment are stated at cost. Depreciation is calculated using the straight-line method over estimated useful lives as follows:
| Useful Lives
Buildings | 39 years
Building improvements | 7 to 15 years
Leasehold improvements | Lesser of useful life or term of lease
Machinery and equipment | 5 to 7 years
Vehicles | 5 years
Tooling | 3 years
Computer equipment | 2 to 6 years
Furniture and office equipment | 2 to 6 years
Demonstration units | 3 years
Property and equipment, net, consists of the following (in thousands):
| July 1, 2017 |  | December 31, 2016
Building and building improvements | $ | 86,015 |  |  | $ | 85,966 |
Machinery and equipment | 43,737 |  |  | 41,683 |
Land | 23,762 |  |  | 23,762 |
Leasehold improvements | 14,908 |  |  | 8,289 |
Computer equipment | 14,199 |  |  | 13,549 |
Tooling | 13,485 |  |  | 12,895 |
Furniture and office equipment | 10,719 |  |  | 9,669 |
Demonstration units | 467 |  |  | 448 |
Vehicles | 45 |  |  | 45 |
Construction-in-progress | 5,654 |  |  | 7,923 |
Total property and equipment | 212,991 |  |  | 204,229 |
Accumulated depreciation and amortization | (75,268 | ) |  | (68,233 | )
Property and equipment, net | $ | 137,723 |  |  | $ | 135,996 |
Fair Value Hierarchy for Financial Assets |
Changes in Product Warranty Accrual | Changes in the product warranty accrual were as follows (in thousands):
| Six Months Ended
| July 1, 2017 |  | July 2, 2016
Warranty accrual, beginning of period | $ | 910 |  |  | $ | 1,222 |
Accrual for warranties issued | 606 |  |  | 521 |
Changes to pre-existing warranties (including changes in estimates) | (5 | ) |  | (40 | )
Settlements made | (485 | ) |  | (488 | )
Warranty accrual, end of period | $ | 1,026 |  |  | $ | 1,215 |
Schedule of Change in Accumulated Other Comprehensive Income | The change in accumulated other comprehensive loss was as follows (in thousands):
| Six Months Ended July 1, 2017
Accumulated other comprehensive loss, beginning of period | $ | (7,027 | )
Foreign currency translation adjustments | 2,866 |
Accumulated other comprehensive loss, end of period | $ | (4,161 | )
Reconciliation of Basic and Diluted Net Income Per Share | reconciliation of basic and diluted net income per share is as follows (in thousands, except per share amounts):
| Three Months Ended |  | Six Months Ended
| July 1, 2017 |  | July 2, 2016 |  | July 1, 2017 |  | July 2, 2016
Net income | $ | 46,680 |  |  | $ | 30,023 |  |  | $ | 92,014 |  |  | $ | 57,600 |
Basic net income per share: |  |  |  |  |  |  |
Weighted-average shares outstanding - basic | 51,677 |  |  | 49,256 |  |  | 51,164 |  |  | 49,340 |
Net income per basic share | $ | 0.90 |  |  | $ | 0.61 |  |  | $ | 1.80 |  |  | $ | 1.17 |
Diluted net income per share: |  |  |  |  |  |  |
Weighted-average shares outstanding - basic | 51,677 |  |  | 49,256 |  |  | 51,164 |  |  | 49,340 |
Diluted share equivalent: stock options and RSUs | 4,496 |  |  | 3,447 |  |  | 4,703 |  |  | 3,064 |
Weighted-average shares outstanding - diluted | 56,173 |  |  | 52,703 |  |  | 55,867 |  |  | 52,404 |
Net income per diluted share | $ | 0.83 |  |  | $ | 0.57 |  |  | $ | 1.65 |  |  | $ | 1.10 |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] | Supplemental cash flow information includes the following (in thousands):
| Six Months Ended
| July 1, 2017 |  | July 2, 2016
Cash paid during the year for: |  |  |
Interest (net of amounts capitalized) | $ | 321 |  |  | $ | 2,603 |
Income taxes | 81,662 |  |  | 19,292 |
Noncash investing and financing activities: |  |  |
Unpaid purchases of property, plant and equipment | $ | 2,113 |  |  | $ | 1,168 |
Unsettled common stock proceeds from option exercises | 237 |  |  | 187 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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