Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 109	$ 2,879
Allowance for Doubtful Accounts Receivable	(10)	(7)
Collaborators [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	14	12
Royalties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	40	2,862
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	65	12
Subtotal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 119	$ 2,886