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Intangible Assets - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 18, 2017 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible amortization expense |  | $ 934,000 | $ 933,000 | $ 2,800,000 | $ 2,797,000
GeoTraq Inc. |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful life of intangible assets |  |  |  | 7 years |
Total consideration transferred | $ 26,097,000 |  |  |  |
Cash paid for acquisition | 200,000 |  |  |  |
Additional intangible assets recorded | 10,134,000 |  |  |  |
Offsetting deferred tax liability | 10,134,000 |  |  |  |
Business combination, other assets acquired | 0 |  |  |  |
Business combination, other Liabilities assumed | $ 0 |  |  |  |
GeoTraq Inc. | Series A1 Preferred Stock |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Stock issued in acquisition | 288,588 |  |  |  |
Fair value of stock issued | $ 14,963,000 |  |  |  |
GeoTraq Inc. | Unsecured Promissory Notes |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Promissory notes annual interest rate | 1.29% |  |  |  |
Promissory notes maturity date | Aug. 18, 2018 |  |  |  |
Promissory notes issued | $ 800,000 |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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