Fair Value Measurements (Details) (Omnifrio Milestone Payments [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Omnifrio Milestone Payments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 2,559	$ 0
Total gains (realized or unrealized)
Original value of milestones recorded at acquisition		3,000
Change in value of milestones, included in loss from discontinued operations	(2,559)	(441)
Balance at end of period	$ 0	$ 2,559