XML 82 R69.htm IDEA: XBRL DOCUMENT v3.10.0.1
Subsequent Events - Additional Information (Detail) - USD ($)
$ in Millions
Oct. 18, 2018
Sep. 26, 2018
Oct. 16, 2018
Deerfield | Tenth Amendment to Facility Agreement | Senior convertible notes due December 31, 2019      
Subsequent Event [Line Items]      
Cash repayment of senior notes under exchange agreement   $ 3.0  
Subsequent Event | Deerfield | Tenth Amendment to Facility Agreement | Senior convertible notes due December 31, 2019      
Subsequent Event [Line Items]      
Cash repayment of senior notes under exchange agreement $ 3.0    
United Therapeutics Corporation | Subsequent Event | Deerfield | Tenth Amendment to Facility Agreement      
Subsequent Event [Line Items]      
Upfront payment received     $ 45.0
United Therapeutics Corporation | Collaboration and License Agreement | Subsequent Event      
Subsequent Event [Line Items]      
Upfront payment received     $ 45.0