Financing Agreement with Novo A/S (Details) $ in Thousands	1 Months Ended			12 Months Ended		20 Months Ended
	Nov. 30, 2014 USD ($)	Jan. 31, 2014 USD ($)	May. 31, 2013 USD ($) tranche	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 USD ($)
Agreement
Royalty rights purchase price				$ 125,000	$ 41,667	$ 125,000
Proceeds from royalty purchase agreement				83,333	$ 41,667
Novo A/S
Agreement
Proceeds from royalty purchase agreement				$ 83,300
Novo A/S | Novo Agreement | Fovista, Fovista-Related Products, and Other Products
Agreement
Number of tranches in financing | tranche			3
Aggregate royalty rights			$ 125,000
Royalty rights purchase price			41,700
Proceeds from royalty purchase agreement	$ 41,700	$ 41,700	$ 41,700			$ 125,000