Collaboration, License and Purchase Agreements - Narrative 3 (Details) (Desitin Arzneimittel GmbH Licensing and Distribution Agreement [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Desitin Arzneimittel GmbH Licensing and Distribution Agreement [Member]
Revenue Recognition, Distribution Agreements [Line Items]
Revenue recognized	$ 397	$ 0	$ 422