Summary of Significant Accounting Policies - Additional Information (Details)	1 Months Ended	3 Months Ended		6 Months Ended			12 Months Ended
	Mar. 31, 2017	Jun. 30, 2018 Customer Vendor	Jul. 01, 2017 Customer Vendor	Jun. 30, 2018 Customer Vendor	Jul. 01, 2017 Customer	Jul. 01, 2017 Customer Vendor	Dec. 30, 2017 Customer
Disclosure Summary Of Significant Accounting Policies [Line Items]
Extended product warranty period				1 year
Period to extend warranty, performance obligation				60 days
Products warranty period				2 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
IQ 532/577 Laser Consoles
Disclosure Summary Of Significant Accounting Policies [Line Items]
Products warranty period	5 years
Revenue, Total | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers		0	0	0	0	0
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases		10.00%	10.00%	10.00%	10.00%
Accounts Receivable | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers		0	0	0	0	0	0
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases		10.00%	10.00%	10.00%			10.00%
Purchases | Vendor 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%	10.00%		10.00%
Number of vendors accounting for total purchases | Vendor		2	0	2		0
Percentage of purchases for accounting		27.00%		26.00%
Royalty Agreements
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers		2		2