Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	$ 817	$ 2,879
Allowance for Doubtful Accounts Receivable	(9)	(7)
Collaborators [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	49	12
Royalties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	750	2,862
Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	27	12
Subtotal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	$ 826	$ 2,886