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Related Party Transactions (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2015
Dec. 31, 2016
Related Party Transaction [Line Items]    
un-recouped advanced royalties and non-recoupable license fees   $ 14,463
An affiliate of one of the Company's principal stockholders | Recoupable Advanced Royalties And Non-recoupable License Fees Agreement    
Related Party Transaction [Line Items]    
Related party transaction amount $ 15,000  
Amount paid to related party for achieved milestones   $ 15,000