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Agreement with Lorem Vascular (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Oct. 31, 2010
Partnership Agreement [Line Items]
Equity purchase price (in dollars per share)		$ 0.49us-gaap_SharePrice	$ 4.50us-gaap_SharePrice
Lorem Vascular [Member] \| Exclusive License [Member]
Partnership Agreement [Line Items]
Total commitment	$ 500
Period of exclusive license	30 years
Lorem Vascular [Member] \| Equity Purchases [Member]
Partnership Agreement [Line Items]
Total commitment	24
Shares of unregistered stock purchased (in shares)	8.0
Equity purchase price (in dollars per share)	$ 3.00
Number of installments in equity purchases	2
Lorem Vascular [Member] \| Product Purchase Commitment [Member]
Partnership Agreement [Line Items]
Total commitment	7
First purchase commitment	2
Second purchase commitment	$ 5