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Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 06, 2020 | Jun. 30, 2020 | Jun. 15, 2020 | Apr. 17, 2020 | Feb. 24, 2020 | Feb. 27, 2019 | Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  | $ 27,000 |  |  |  |
Merger and acquisition expenses |  |  |  |  |  |  | $ 100 | $ 100 | $ 1,500 | $ 1,900
FTT Inc |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  | 80.10% |  |  |  |
FTT Core |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  | 80.10% |  |  |  |
FTT |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  | 80.10% |  |  |  |
Aggregate purchase price |  |  |  |  |  | $ 60,000 |  |  |  |
Total cash paid |  |  |  |  |  | 33,000 |  |  |  |
Payment to Acquire Business, At Closing |  |  |  |  |  | 17,700 |  |  |  |
Amount to be paid |  |  |  |  |  | $ 15,300 |  |  |  |
Payment period |  |  |  |  |  | 3 years |  |  |  |
Current liabilities |  |  |  |  |  | $ 7,500 |  |  |  |
Deferred tax liabilities |  |  |  |  |  | 7,000 |  |  |  |
Revenue |  |  |  |  |  |  |  | 16,300 |  | 37,700
Operating income |  |  |  |  |  |  |  | 700 |  | 1,000
Merger and acquisition expenses |  |  |  |  |  |  |  | $ 0 |  | $ 1,300
Cash paid |  |  |  |  |  | $ 20,700 |  |  |  |
FTT | Subsequent event |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Working capital adjustments | $ 1,950 |  |  |  |  |  |  |  |  |
FTT | Common Stock |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  |  | 1,825,406 |  |  |  | 1,825,406
FTT | Customer relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | $ 19,700 |  |  |  |
Useful life |  |  |  |  |  | 13 years |  |  |  |
FTT | In-process research and development |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | $ 8,500 |  |  |  |
FTT | Contracts and backlog |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | $ 2,100 |  |  |  |
Useful life |  |  |  |  |  | 2 years |  |  |  |
FTT | Trade names |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | $ 500 |  |  |  |
Useful life |  |  |  |  |  | 2 years |  |  |  |
Technical Directions, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Working capital adjustments |  |  |  |  |  |  | 300 |  |  |
Cash paid |  |  |  |  | $ 10,500 |  |  |  |  |
Optimized Performance Machining, Inc. (OPM) |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Working capital adjustments |  |  |  |  |  |  | 30 |  |  |
Cash paid |  |  |  | $ 1,800 |  |  |  |  |  |
CPI ASC Signal Division, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current liabilities |  | $ 9,100 |  |  |  |  |  |  |  |
Deferred tax liabilities |  | 1,300 |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 10,200 |  |  |
Operating income |  |  |  |  |  |  | 700 |  |  |
Merger and acquisition expenses |  |  |  |  |  |  | $ 100 |  | $ 1,100 |
Cash paid |  | 34,900 | $ 35,000 |  |  |  |  |  |  |
Intangible assets |  | $ 4,300 |  |  |  |  |  |  |  |
CPI ASC Signal Division, Inc. | Customer relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life |  | 5 years |  |  |  |  |  |  |  |
Intangible assets |  | $ 2,000 |  |  |  |  |  |  |  |
CPI ASC Signal Division, Inc. | Trade names |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life |  | 1 year |  |  |  |  |  |  |  |
Intangible assets |  | $ 100 |  |  |  |  |  |  |  |
CPI ASC Signal Division, Inc. | Developed technology and technical know-how |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life |  | 7 years |  |  |  |  |  |  |  |
Intangible assets |  | $ 2,200 |  |  |  |  |  |  |  |

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