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Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
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Jan. 02, 2016 USD ($) Customer | Jan. 03, 2015 USD ($) Customer | Dec. 28, 2013 USD ($) Customer | Dec. 29, 2012 USD ($)
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash |  |  |  | $ 510,000
Percentage of purchase price to be deposited in escrow account |  |  |  | 10.00%
Provision of sales returns | $ 60,000 | $ 47,000 |  |
Gross value of demos and loaners | 1,600,000 | 1,400,000 |  |
Accumulated amortization on inventory demos and loaners | $ 575,000 | 524,000 |  |
Estimated useful life of demos and loaners | 4 years |  |  |
Estimated useful lives of the assets |  |  | 3 years |
Products warranty period | 2 years |  |  |
Shipping and handling costs | $ 300,000 | 300,000 | $ 300,000 |
Advertising and promotion costs | 100,000 | $ 200,000 | $ 100,000 |
Accrued interest and penalty incurred | $ 0 |  |  |
Customer accounted percentage of net accounts receivable balance | 10.00% | 13.00% | 10.00% |
Revenue, Total | Customer Concentration Risk |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of customer accounted for total revenues and net accounts receivable | Customer | 0 | 0 | 0 |
Customer accounted percentage of total revenues | 10.00% | 10.00% | 10.00% |
Accounts Receivable | Credit Concentration Risk |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of customer accounted for total revenues and net accounts receivable | Customer | 0 | 1 |  |

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