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Certain Balance Sheet Items Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable, Net [Abstract]    
Accounts receivable from revenues under collaborative agreements $ 25,939 $ 1,266
Accounts receivable from product sales to collaborators 4,996 6,361
Accounts receivable from other product sales 2,442 2,133
Accounts receivable, gross 33,377 9,760
Allowance for distribution fees and discounts (967) (611)
Accounts receivable, net $ 32,410 $ 9,149