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Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
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Dec. 28, 2019 USD ($) Customer | Dec. 29, 2018 USD ($) Customer
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |
Provision for sales returns | $ 264,000 | $ 277,000
Gross value of demos and loaners | 2,800,000 | 3,100,000
Accumulated amortization on inventory demos and loaners | $ 1,400,000 | 1,400,000
Estimated useful life of demos and loaners | 4 years |
Estimated useful lives of the assets | 3 years |
Extended product warranty period | 1 year |
Extended warranty, period to determine nature of sale | 60 days |
Products warranty period | 2 years |
Advertising and promotion costs | $ 300,000 | 500,000
Accrued interest and penalty incurred | 0 | $ 0
Right-of-use assets | 2,764,000 |
Lease liabilities | 3,209,000 |
ASU 2016-02 |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |
Right-of-use assets | 4,000,000 |
Lease liabilities | 4,500,000 |
Deferred rent related to operating lease | $ 500,000 |
Revenue, Total | Customer Concentration Risk |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |
Number of customers | Customer | 0 | 0
Accounts Receivable | Customer Concentration Risk |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases | 10.00% |
Accounts Receivable | Credit Concentration Risk |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |
Number of customers | Customer | 1 | 0
Revenue Benchmark | Customer Concentration Risk |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases | 10.00% | 10.00%
Percentage of revenues accounted | 11.00% |
Shipping and Handling |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |
Shipping and handling costs | $ 200,000 | $ 300,000
Royalty Agreements |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |
Number of customers | Customer | 2 |

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