XML 109 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Cover - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-32335    
Entity Registrant Name HALOZYME THERAPEUTICS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 88-0488686    
Entity Address, Address Line One 11388 Sorrento Valley Road    
Entity Address, Postal Zip Code 92121    
Entity Address, City or Town San Diego    
Entity Address, State or Province CA    
City Area Code 858    
Local Phone Number 794-8889    
Title of 12(b) Security Common Stock, $0.001 Par Value    
Trading Symbol HALO    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 2.5
Entity Common Stock, Shares Outstanding   138,226,070  
Entity Central Index Key 0001159036    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31