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Summary of Significant Accounting Policies - Additional Information (Details)
 1 Months Ended 12 Months Ended
Jan. 01, 2017
USD ($)
Mar. 31, 2017
Dec. 30, 2017
USD ($)
Customer
Dec. 31, 2016
USD ($)
Customer
Jan. 02, 2016
USD ($)
Customer
Disclosure Summary Of Significant Accounting Policies [Line Items]          
Provision for sales returns     $ 570,000 $ 44,000  
Gross value of demos and loaners     2,400,000 1,600,000  
Accumulated amortization on inventory demos and loaners     $ 850,000 490,000  
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     200,000 100,000 $ 100,000
Accrued interest and penalty incurred     0 0  
Net of operating loss carry-forwards converted into deferred tax net operating losses due to windfall effect     $ 5,757,000 $ 4,411,000  
ASU No. 2016-09          
Disclosure Summary Of Significant Accounting Policies [Line Items]          
Net of operating loss carry-forwards converted into deferred tax net operating losses due to windfall effect $ 1,390,000        
Increase in valuation allowance due to windfall effect $ 1,390,000        
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 and supplier accounted percentage of total revenues, accounts receivable and purchases     10.00% 10.00% 10.00%
Accounts Receivable | 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  
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases     10.00% 10.00%  
IQ 532/577 Laser Consoles          
Disclosure Summary Of Significant Accounting Policies [Line Items]          
Products warranty period   5 years