Segment Reporting (Revenue by Product Line) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue from External Customer [Line Items]
Revenue	$ 43,555	$ 39,453	$ 83,169	$ 77,128
Disposable Products
Revenue from External Customer [Line Items]
Revenue	38,610	33,975	73,101	66,247
Disposable Products | Vascular intervention
Revenue from External Customer [Line Items]
Revenue	22,496	18,897	42,517	36,090
Disposable Products | Lead management
Revenue from External Customer [Line Items]
Revenue	16,114	15,078	30,584	30,157
Service and other, net of allowance for sales returns
Revenue from External Customer [Line Items]
Revenue	2,872	2,888	5,641	5,766
Equipment sales and rentals
Revenue from External Customer [Line Items]
Revenue	2,073	2,590	4,427	5,115
U.S. Medical
Revenue from External Customer [Line Items]
Revenue	34,854	32,310	66,626	63,101
U.S. Medical | Disposable Products
Revenue from External Customer [Line Items]
Revenue	31,744	28,239	60,326	55,188
U.S. Medical | Service and other, net of allowance for sales returns
Revenue from External Customer [Line Items]
Revenue	2,331	2,524	4,567	5,032
U.S. Medical | Equipment sales and rentals
Revenue from External Customer [Line Items]
Revenue	779	1,547	1,733	2,881
International Medical
Revenue from External Customer [Line Items]
Revenue	8,701	7,143	16,543	14,027
International Medical | Disposable Products
Revenue from External Customer [Line Items]
Revenue	6,866	5,736	12,775	11,059
International Medical | Service and other, net of allowance for sales returns
Revenue from External Customer [Line Items]
Revenue	541	364	1,074	734
International Medical | Equipment sales and rentals
Revenue from External Customer [Line Items]
Revenue	$ 1,294	$ 1,043	$ 2,694	$ 2,234