Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019
Deferred revenue					$ 2,800,000
Deferred revenue, recognized	$ 400,000		$ 1,600,000
Remaining service period to recognize deferred revenue, description			2024
Capitalized contract cost, net	400,000		$ 400,000		400,000
Laser revenue	200,000	$ 100,000	500,000	$ 300,000
New accounting pronouncement or change in accumulated deficit					21,000
Operating lease right-of-use-assets	2,919,000		2,919,000
Operating lease, liability	$ 3,010,000		$ 3,010,000
ASU 2016-02 [Member]
Operating lease right-of-use-assets					3,200,000
Operating lease, liability					$ 3,200,000
Minimum [Member]
Regular warranty service contracts term			12 months
Maximum [Member]
Extended warranty service contracts term			60 months
Capitalized contract cost amortization period			1 year