Goodwill and Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Less: accumulated amortization	$ (39,105)	$ (33,267)
Other intangible assets, net	92,391	98,229
Patents
Finite-Lived Intangible Assets [Line Items]
Patents	530	530
Stellarex | In-process research and development
Finite-Lived Intangible Assets [Line Items]
In-process research and development	13,680	13,680
Stellarex | Technology
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	9,000	9,000
Stellarex | Trademark and trade names
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	400	400
Stellarex | Transition services agreement
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	530	530
AngioScore | In-process research and development
Finite-Lived Intangible Assets [Line Items]
In-process research and development	1,254	1,254
AngioScore | Technology
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	73,510	73,510
AngioScore | Trademark and trade names
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	4,380	4,380
AngioScore | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	23,320	23,320
AngioScore | Distributor relationships
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	1,940	1,940
AngioScore | Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	580	580
Upstream | Technology
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	2,172	2,172
Upstream | Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 200	$ 200