Organization (Details) $ in Thousands	12 Months Ended		60 Months Ended
	Dec. 31, 2015 USD ($) product	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2013 USD ($)
Organization
Number of biosimilar product candidates | product	3
Cash and cash equivalents	$ 31,515	$ 21,462	$ 31,515	$ 1,798
Accumulated deficit	(138,759)	(86,571)	(138,759)
Net loss	$ (52,188)	$ (41,844)	$ (138,759)