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Financing Arrangements (Narrative) (Details)
1 Months Ended 9 Months Ended
Aug. 31, 2014
USD ($)
d
$ / shares
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Initial debt value   $ 202,951,000   $ 195,908,000
Long-term debt issuance costs   2,747,000   3,388,000
Common stock, shares available to be issued | shares 3,264,643      
Exercise price of convertible bond hedge | $ / shares $ 75.05      
Payment for convertible bond hedges   0 $ 48,143,000  
Exercise price | $ / shares $ 125.08      
Proceeds from issuance of warrants $ 11,600,000      
2019 convertible senior notes        
Debt Instrument [Line Items]        
Aggregate principal amount outstanding   245,000,000   245,000,000
Initial debt value   202,951,000   195,908,000
Convertible notes payable, Viking Therapeutics, Inc.        
Debt Instrument [Line Items]        
Current notes payable   0   334,000
Senior Notes        
Debt Instrument [Line Items]        
Payment for convertible bond hedges $ 48,100,000      
Senior Notes | 2019 convertible senior notes        
Debt Instrument [Line Items]        
Interest rate 0.75%      
Aggregate principal amount outstanding $ 245,000,000.0      
Net proceeds from note after debt issuance costs $ 239,300,000      
Initial conversion rate 0.0133251      
Initial conversion price | $ / shares $ 75.05      
Proceeds from issuance of debt $ 245,000,000      
Debt discount rate 5.83%      
Initial debt value $ 192,500,000      
If-converted value in excess of principal   29,000,000    
Debt issuance costs 5,700,000      
Equity component of convertible debt recorded as a reduction to additional paid-in capital 1,200,000      
Long-term debt issuance costs $ 4,500,000      
Term of notes 5 years      
Carrying value of the equity component of debt, net of issuance costs   $ 51,300,000   $ 51,300,000
Senior Notes | 2019 convertible senior notes | Debt Instrument, Redemption, Period One        
Debt Instrument [Line Items]        
Threshold trading days | d 20      
Consecutive trading days 30 days      
Percentage of stock price trigger 130.00%      
Senior Notes | 2019 convertible senior notes | Debt Instrument, Redemption, Period Two        
Debt Instrument [Line Items]        
Threshold trading days | d 5      
Consecutive trading days 10 days      
Maximum threshold percentage of debt trading price trigger 98.00%