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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 29, 2019 USD ($) Customer | Jun. 30, 2018 Customer | Jun. 29, 2019 USD ($) Customer | Jun. 30, 2018 USD ($) | Dec. 29, 2018 Customer | Dec. 30, 2018 USD ($)
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Extended product warranty period |  |  | 1 year |  |  |
Extended warranty, period to determine nature of sale |  |  | 60 days |  |  |
Deferred revenue recognized |  |  | $ 800 | $ 900 |  |
Products warranty period |  |  | 2 years |  |  |
Right-of-use assets | $ 3,390 |  | $ 3,390 |  |  | $ 4,000
Lease liabilities | $ 3,879 |  | $ 3,879 |  |  | 4,500
Deferred rent related to operating lease |  |  |  |  |  | $ 500
Revenue, Total | Customer Concentration Risk |  |  |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of customers | Customer | 0 | 0 | 0 |  |  |
Accounts Receivable | Credit Concentration Risk |  |  |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of customers | Customer |  |  | 0 |  | 0 |
Royalty Agreements |  |  |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of customers | Customer |  |  | 2 |  |  |
IQ 532/577 Laser Consoles |  |  |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Products warranty period |  |  | 5 years |  |  |

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