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Revenue - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 28, 2018 | Jan. 01, 2018
Adoption of Topic 606 |  |
Revenue [Line Items] |  |
Contract liabilities | $ 4.8 | $ 5.4
Revenue recognized | $ 3.0 |
Warranties |  |
Revenue [Line Items] |  |
Standard product warranty description | The Company generally provides warranties for its products. The standard warranty period is typically 12 months to 24 months for the Photonics and Precision Motion segments and 12 months to 36 months for the Vision segment. The standard warranty period for product sales is accounted for under the provisions of ASC 450, “Contingencies,” as the Company has the ability to ascertain the likelihood of the liability and can reasonably estimate the amount of the liability. |
Accounts Receivable |  |
Revenue [Line Items] |  |
Standard payment terms | 30 days |
Maximum |  |
Revenue [Line Items] |  |
Percentage of revenue for professional services | 3.00% |
Period when revenue for professional and engineering services requested under customer contract is recognized | 1 month |
Incremental Cost amortization expected period | 1 year |
Transfer of a promised good to a customer and the customer’s payment | 1 year |
Remaining performance obligation for contracts | 1 year |
Maximum | Photonics and Precision Motion | Warranties |  |
Revenue [Line Items] |  |
Standard warranty period on products | 24 months |
Maximum | Vision | Warranties |  |
Revenue [Line Items] |  |
Standard warranty period on products | 36 months |
Minimum | Photonics and Precision Motion | Warranties |  |
Revenue [Line Items] |  |
Standard warranty period on products | 12 months |
Minimum | Vision | Warranties |  |
Revenue [Line Items] |  |
Standard warranty period on products | 12 months |

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