Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 2,434	$ 3,543
Allowance for Doubtful Accounts Receivable	0	(10)
Collaborators [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	166	63
Royalties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	2,189	3,463
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	79	27
Subtotal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 2,434	$ 3,553