Summary of Significant Accounting Policies - Additional Information (Details) - Customer	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2017	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Dec. 31, 2016
IQ 532/577 Laser Consoles
Disclosure Summary Of Significant Accounting Policies [Line Items]
Products warranty period	5 years
Minimum
Disclosure Summary Of Significant Accounting Policies [Line Items]
Products warranty period				1 year
Maximum
Disclosure Summary Of Significant Accounting Policies [Line Items]
Products warranty period				2 years
Revenue, Total | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customer accounted for total revenues and net accounts receivable		0	0	0	0
Customer accounted percentage of total revenues		10.00%	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		0	0	0	0	0
Customer accounted percentage of total revenues		10.00%	10.00%	10.00%		10.00%