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Financing Arrangements (Narrative) (Details)
1 Months Ended 6 Months Ended
Aug. 31, 2014
USD ($)
d
$ / shares
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 12, 2014
$ / shares
Jul. 31, 2014
Debt Instrument [Line Items]          
Additional final payment on borrowings (percent)         6.00%
Initial debt value   $ 200,567,000 $ 195,908,000    
Long-term debt issuance costs   2,964,000 3,388,000    
Common stock, shares available to be issued | shares 3,264,643        
Exercise price of convertible bond hedge | $ / shares $ 75.05        
Exercise price | $ / shares $ 125.08        
Proceeds from issuance of warrants $ 11,600,000        
Common Stock          
Debt Instrument [Line Items]          
Share price | $ / shares       $ 55.59  
2019 convertible senior notes          
Debt Instrument [Line Items]          
Aggregate principal amount outstanding   245,000,000 245,000,000    
Initial debt value   200,567,000 195,908,000    
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        
Premium percentage 35.00%        
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   77,800,000      
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%