Contingently Issuable Common Stock (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		0 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended		3 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 10, 2010 Nellix	Jun. 30, 2014 Nellix	Jun. 30, 2014 Nellix	Dec. 10, 2010 Nelix Milestones	Jun. 17, 2014 OUS Milestone	Jun. 30, 2014 OUS Milestone	Jun. 30, 2014 OUS Milestone Common Stock	Jun. 16, 2014 OUS Milestone Common Stock Minimum	Jun. 16, 2014 OUS Milestone Common Stock Maximum	Jun. 30, 2014 PMA Milestone	Dec. 10, 2010 PMA Milestone	Dec. 10, 2010 PMA Milestone Maximum
Business Acquisition [Line Items]
Purchase price common shares					3.2				2.7
Common shares value					$ 19,400,000										$ 15,000,000
Number of Shares, Contingently Issuable								10.2						1.1
Estimated fair value of Contingent payment								28,200,000
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, Low											10,000,000
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High										24,000,000
Business Acquisition, Share Price												$ 3.50	$ 7.50			$ 4.50
Closing stock price														$ 15.21
Contingent consideration, at fair value hypothetical value														16,700,000
Fair Value of Contingently Issuable Common Stock [Roll Forward]
December 31, 2013							60,900,000
Fair Value of OUS Milestone Shares	3,772,000	(7,600,000)	(8,028,000)	(2,400,000)		(8,028,000)	(38,372,000)
June 30, 2014						$ 14,500,000	$ 14,500,000