Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 2,879	$ 6,937
Allowance for Doubtful Accounts Receivable	(7)	0
Collaborators [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	12	6,125
Royalties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	2,862	781
Research grants [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	0	12
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	12	19
Subtotal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 2,886	$ 6,937