Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	$ 18,300		$ 18,300		$ 17,200
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	18,300		18,300		17,200
Money Market Funds	92,829		92,829		112,808
Asset, total	92,829		92,829		112,808
Liability, total	18,300		18,300		17,200
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	0		0		0
Money Market Funds	92,829		92,829		112,808
Asset, total	92,829		92,829		112,808
Liability, total	0		0		0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	0		0		0
Money Market Funds	0		0		0
Asset, total	0		0		0
Liability, total	0		0		0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	18,300		18,300		17,200
Money Market Funds	0		0		0
Asset, total	0		0		0
Liability, total	18,300		$ 18,300		$ 17,200
Azedra commercialization [Member]
Fair Value Measurements, Quantitative Information
Period of milestone expected achievement			2018		2018
Fair Value	2,400		$ 2,400		$ 2,300
Valuation technique			Probability adjusted discounted cash flow model		Probability adjusted discounted cash flow model
Discount Rate			10.00%		10.00%
Probability of success			40.00%		40.00%
MIP - 1404 commercialization [Member]
Fair Value Measurements, Quantitative Information
Period of milestone expected achievement			2019		2019
Fair Value	4,000		$ 4,000		$ 3,800
Valuation technique			Probability adjusted discounted cash flow model		Probability adjusted discounted cash flow model
Discount Rate			10.00%		10.00%
Probability of success			59.00%		59.00%
MIP-1095 commercialization [Member]
Fair Value Measurements, Quantitative Information
Period of milestone expected achievement			2023		2023
Fair Value	500		$ 500		$ 400
Valuation technique			Probability adjusted discounted cash flow model		Probability adjusted discounted cash flow model
Discount Rate			10.00%		10.00%
Probability of success			19.00%		19.00%
Net sales targets [Member]
Fair Value Measurements, Quantitative Information
Fair Value	11,400		$ 11,400		$ 10,700
Valuation technique			Monte-Carlo simulation		Monte-Carlo simulation
Net sales targets [Member] | Minimum [Member]
Fair Value Measurements, Quantitative Information
Period of milestone expected achievement			2019		2019
Discount Rate			3.50%		3.50%
Probability of success			19.00%		19.00%
Net sales targets [Member] | Maximum [Member]
Fair Value Measurements, Quantitative Information
Period of milestone expected achievement			2026		2026
Discount Rate			12.00%		12.00%
Probability of success			59.00%		59.00%
Net sales targets [Member] | Weighted average [Member]
Fair Value Measurements, Quantitative Information
Probability of success			37.40%		37.40%
Contingent Consideration Liability [Member]
Summary of activities in financial instruments with significant Level 3 inputs [Roll Forward]
Balance at beginning of period	17,500	$ 16,200	$ 17,200	$ 15,700	$ 15,700
Total realized/unrealized gains (losses)
Fair value change to contingent consideration included in net loss	800	400	1,100	900
Balance at end of period	18,300	16,600	18,300	16,600	$ 17,200
Changes in unrealized gains or losses for the period included in earnings (or changes in net assets) for liabilities held at the end of the reporting period	$ 800	$ 400	$ 1,100	$ 900