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Commitments and Contingencies - Settlement and Royalty Indemnity (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]    
Settlement and royalty indemnity obligation, short-term $ 5,275 $ 3,749
Settlement and royalty indemnification, long-term 16,218 20,273
Total settlement and royalty indemnity $ 21,493 $ 24,022