Revenue (Details) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Abstract]
Revenues, net	$ 7,729	$ 7,388	$ 6,738	$ 7,456	$ 8,445	$ 7,269	$ 14,126	$ 15,714	$ 21,856	$ 23,169	$ 29,855	$ 31,763
Dermatology Recurring Procedures [Member]
Disaggregation of Revenue [Abstract]
Revenues, net											21,053	22,954
Dermatology Procedures Equipment [Member]
Disaggregation of Revenue [Abstract]
Revenues, net											8,802
Dermatology Procedures Equipment and Imaging [Member]
Disaggregation of Revenue [Abstract]
Revenues, net												8,809
Domestic [Member]
Disaggregation of Revenue [Abstract]
Revenues, net											23,079	26,492
Domestic [Member] | Dermatology Recurring Procedures [Member]
Disaggregation of Revenue [Abstract]
Revenues, net											21,053	22,954
Domestic [Member] | Dermatology Procedures Equipment [Member]
Disaggregation of Revenue [Abstract]
Revenues, net											2,026
Domestic [Member] | Dermatology Procedures Equipment and Imaging [Member]
Disaggregation of Revenue [Abstract]
Revenues, net												3,538
Foreign [Member]
Disaggregation of Revenue [Abstract]
Revenues, net											6,776	5,271
Foreign [Member] | Dermatology Recurring Procedures [Member]
Disaggregation of Revenue [Abstract]
Revenues, net											0	0
Foreign [Member] | Dermatology Procedures Equipment [Member]
Disaggregation of Revenue [Abstract]
Revenues, net											$ 6,776
Foreign [Member] | Dermatology Procedures Equipment and Imaging [Member]
Disaggregation of Revenue [Abstract]
Revenues, net												$ 5,271