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Basis of Presentation and Summary of Significant Accounting Policies (Details 2) (USD $)
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2014
Sales Revenue Net [Member]
Customer Concentration Risk [Member]
Amerisource Bergen Drug Corporation [Member]
Jun. 30, 2013
Sales Revenue Net [Member]
Customer Concentration Risk [Member]
Amerisource Bergen Drug Corporation [Member]
Jun. 30, 2014
Sales Revenue Net [Member]
Customer Concentration Risk [Member]
Mc Kesson Corporation [Member]
Jun. 30, 2013
Sales Revenue Net [Member]
Customer Concentration Risk [Member]
Mc Kesson Corporation [Member]
Jun. 30, 2014
Sales Revenue Net [Member]
Customer Concentration Risk [Member]
Cardinal Health Inc [Member]
Jun. 30, 2013
Sales Revenue Net [Member]
Customer Concentration Risk [Member]
Cardinal Health Inc [Member]
Jun. 30, 2014
Sales Revenue Net [Member]
Customer Concentration Risk [Member]
Takeda Pharmaceutical Company Limited [Member]
Jun. 30, 2013
Sales Revenue Net [Member]
Customer Concentration Risk [Member]
Takeda Pharmaceutical Company Limited [Member]
Jun. 30, 2014
Sales Revenue Net [Member]
Customer Concentration Risk [Member]
Group Purchasing Organization [Member]
Jun. 30, 2013
Sales Revenue Net [Member]
Customer Concentration Risk [Member]
Group Purchasing Organization [Member]
Jun. 30, 2014
Sales Revenue Net [Member]
Geographic Concentration Risk [Member]
Jun. 30, 2013
Sales Revenue Net [Member]
Geographic Concentration Risk [Member]
Investment Concentration Risk                                
Cash, cash equivalents and investments $ 386,500,000                              
Investment in institutional money market funds 196,800,000                              
Cash and cash equivalents 202,057,000 26,986,000 27,802,000 46,293,000                        
Amount invested in a single fund $ 179,900,000                              
Customers representing 10% or more of revenues                                
Percentage of revenues from major customer         38.00% 43.00% 25.00% 23.00% 17.00% 15.00% 10.00% 11.00% 27.00% 32.00%    
Percentage of revenues From customers outside of the U.S.                                
Approximate percentage of revenues from customers outside the U.S.                             12.00% 12.00%