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Description of Business (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jul. 18, 2017
Jul. 12, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Corporate Information, Status of Operations and Management Plans              
Changes in fair value of contingent consideration payable     $ 244,250 $ 4,110 $ 238,622 $ (9,228)  
Contingent consideration payable     21,100   21,100   $ 269,722
Loss on impairment     465,427   465,427    
Net proceeds from the issuance of common stock         243,036 $ 97,068  
SD-101              
Corporate Information, Status of Operations and Management Plans              
Loss on impairment related to fixed assets         1,700    
Changes in fair value of contingent consideration payable     254,700        
Contingent consideration payable     $ 0   0    
Selling, general and administrative costs due to wind-down         400    
Research and development expenses due to wind-down         8,100    
Common Stock              
Corporate Information, Status of Operations and Management Plans              
Number of common stock issued from underwriting agreement   21,122,449          
Price per share of common stock issued (in dollars per share)   $ 12.25          
Gross proceeds from issue of common stock before deducting underwriting discounts and commissions   $ 258,800          
Net proceeds from the issuance of common stock $ 243,000       243,000    
IPR&D              
Corporate Information, Status of Operations and Management Plans              
Loss on impairment of intangible assets         463,700    
IPR&D | SD-101              
Corporate Information, Status of Operations and Management Plans              
Loss on impairment of intangible assets         $ 463,700