Goodwill and Intangible Assets, Net - Components of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 65,774	$ 64,708
Accumulated Amortization	(46,490)	(44,878)
Net	19,284	19,830
Gross value of fully amortized intangible assets	7,600	7,400
Distribution rights
Finite-Lived Intangible Assets, Net [Abstract]
Gross	316	322
Accumulated Amortization	(213)	(210)
Net	103	112
Patents
Finite-Lived Intangible Assets, Net [Abstract]
Gross	17,625	16,587
Accumulated Amortization	(6,705)	(6,491)
Net	10,920	10,096
Trademarks and trade names
Finite-Lived Intangible Assets, Net [Abstract]
Gross	2,786	2,785
Accumulated Amortization	(2,282)	(2,205)
Net	504	580
Developed and core technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross	12,480	12,480
Accumulated Amortization	(10,515)	(10,016)
Net	1,965	2,464
Capitalized software development costs
Finite-Lived Intangible Assets, Net [Abstract]
Gross	33	0
Accumulated Amortization	0	0
Net	33	0
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross	32,534	32,534
Accumulated Amortization	(26,775)	(25,956)
Net	$ 5,759	$ 6,578