Contingently Issuable Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			3 Months Ended		6 Months Ended
	Jun. 17, 2014	Dec. 10, 2010	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 16, 2014
Fair Value of Contingently Issuable Common Stock [Roll Forward]
December 31, 2014					$ 14,600
Fair Value Adjustment of Contingent Payment for the six months ended June 30, 2015			$ 100	$ 3,772	200	$ (8,028)
June 30, 2015			$ 14,800		14,800
Nelix Milestones
Business Acquisition [Line Items]
Number of shares contingently issuable		10.2
Estimated fair value of contingent payment		$ 28,200
OUS Milestone
Business Acquisition [Line Items]
Purchase price common shares	2.7
OUS Milestone | Common Stock
Business Acquisition [Line Items]
Contingent consideration, liability, value, low					$ 10,000
Contingent consideration, liability, shares, low					1.3
Contingent consideration, liability, value, high					$ 24,000
Contingent consideration, liability, shares, high					6.9
OUS Milestone | Common Stock | Minimum
Business Acquisition [Line Items]
Share price							$ 3.50
OUS Milestone | Common Stock | Maximum
Business Acquisition [Line Items]
Share price							$ 7.50
PMA Milestone
Business Acquisition [Line Items]
Common shares value		$ 15,000
Number of shares contingently issuable					0.9
Closing stock price			$ 15.34		$ 15.34
Contingent consideration, at fair value hypothetical value			$ 13,800		$ 13,800
PMA Milestone | Maximum
Business Acquisition [Line Items]
Share price		$ 4.50
Nellix
Business Acquisition [Line Items]
Purchase price common shares		3.2
Common shares value		$ 19,400