Goodwill and Intangible Assets - Major Categories of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, accumulated amortization	$ (10,134)	$ (9,378)
Total	46,818	48,375
Indefinite-lived Intangible Assets [Line Items]
Intangible assets gross carrying amount	56,952	57,753
Intangible assets net carrying amount	46,818	48,375
Product acquisition costs
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	13,086	13,308
In process research and development ("IPR&D")
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	649	719
Trademarks and Technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	39,607	40,169
Finite-lived intangible assets, accumulated amortization	(8,904)	(8,239)
Total	$ 30,703	$ 31,930
Weighted average remaining amortization period	11 years 6 months	11 years 9 months 18 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	$ 3,610	$ 3,557
Finite-lived intangible assets, accumulated amortization	(1,230)	(1,139)
Total	$ 2,380	$ 2,418
Weighted average remaining amortization period	6 years 7 months 6 days	6 years 10 months 24 days