Segment Reporting - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment		2
Property and equipment, net	$ 5,418	$ 5,418	$ 4,757
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	13.00%
Vascular [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 2,700	2,700	2,200
Dermatology [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 800	$ 800	$ 700