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License Agreements (Details)
3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2011
Series A-1 Convertible Preferred Stock
May 11, 2011
License agreement
Ipsen
Mar. 31, 2014
License agreement
Ipsen
USD ($)
Mar. 31, 2013
License agreement
Ipsen
USD ($)
Dec. 31, 2013
License agreement
Ipsen
USD ($)
Dec. 31, 2012
License agreement
Ipsen
USD ($)
Dec. 31, 2011
License agreement
Ipsen
USD ($)
Dec. 31, 2005
License agreement
Ipsen
USD ($)
May 17, 2011
License agreement
Ipsen
Series A-1 Convertible Preferred Stock
Dec. 31, 2011
License agreement
Ipsen
Series A-1 Convertible Preferred Stock
USD ($)
Mar. 31, 2014
License agreement
Ipsen
Minimum
USD ($)
Mar. 31, 2014
License agreement
Ipsen
Minimum
EUR (€)
Dec. 31, 2013
License agreement
Ipsen
Minimum
USD ($)
Dec. 31, 2013
License agreement
Ipsen
Minimum
EUR (€)
Mar. 31, 2014
License agreement
Ipsen
Maximum
USD ($)
Mar. 31, 2014
License agreement
Ipsen
Maximum
EUR (€)
Dec. 31, 2013
License agreement
Ipsen
Maximum
USD ($)
Dec. 31, 2013
License agreement
Ipsen
Maximum
EUR (€)
Dec. 31, 2013
License agreement
Ipsen
Sublicense Agreement
Mar. 31, 2014
License agreement
Ipsen
Sublicense Agreement
Minimum
License Agreements                                                  
Nonrefundable, non-creditable payment                         $ 250,000                        
Additional payments to be made upon achievement of certain development and commercialization milestones                               13,800,000 10,000,000 13,800,000 10,000,000 50,000,000 36,000,000 49,600,000 36,000,000    
Royalty rate (as a percent)               5.00%   5.00%                              
Period after the date of the first commercial sale of the product for license expiration                   10 years           10 years 10 years             10 years 10 years
Amount recorded in research and development expense $ 9,717,000 $ 17,287,000 $ 60,536,000 $ 54,961,000 $ 36,179,000     $ 100,000 $ 100,000 $ 200,000 $ 700,000 $ 1,000,000     $ 1,400,000                    
Number of days prior to closing on which shares issuable was determined based upon the U.S. dollar exchange rate for Euro             2 days                                    
Issuance of preferred stock (in shares)           922,286               17,326                      
Fair value per share of preferred stock (in dollars per share)                             $ 81.42