Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Dec. 31, 2012
Restructuring [Abstract]
Restructuring accrual of severance and related benefits			$ 1,500	$ 1,900
Lease termination payment - Molecular	900
Lease termination payment - Progenics	459
Activity in restructuring accrual [Roll Forward]
Balance at beginning of period	1,436	813
Additions, net	1,389	1,477
Payments	(2,288)	(854)
Balance at end of period	537	1,436		813
Severance and Related Benefits [Member]
Activity in restructuring accrual [Roll Forward]
Balance at beginning of period	1,436	813
Additions, net	15	1,477
Payments	(914)	(854)
Balance at end of period	537	1,436
Other Exit Costs [Member]
Activity in restructuring accrual [Roll Forward]
Balance at beginning of period	0	0
Additions, net	15	0
Payments	(15)	0
Balance at end of period	0	0
Contract Termination Costs [Member]
Activity in restructuring accrual [Roll Forward]
Balance at beginning of period	0	0
Additions, net	1,359	0
Payments	(1,359)	0
Balance at end of period	$ 0	$ 0