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Organization and Significant Accounting Policies, Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Organization and Significant Accounting Policies [Abstract]    
Clincial expenses $ 16,347 $ 23,428
In-licensing expenses 33,790 6,430
Other miscellanous accruals 16,481 6,155
Total accrued liabilities $ 66,618 $ 36,013