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Organization and Summary of Significant Accounting Policies - Net Loss per Share (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Anti-Dilutive Securities      
Anti-dilutive securities (in shares) 10,170,000 10,051,000 10,418,000
Share issuances under equity incentive plans and ESPP      
Anti-Dilutive Securities      
Anti-dilutive securities (in shares) 3,492,000 3,369,000 3,709,000
RSAs      
Anti-Dilutive Securities      
Anti-dilutive securities (in shares) 2,000 6,000 33,000
Shares issuances upon the conversion of convertible senior notes      
Anti-Dilutive Securities      
Anti-dilutive securities (in shares) 6,676,000 6,676,000 6,676,000
Performance-based vesting      
Anti-Dilutive Securities      
Anti-dilutive securities (in shares) 978,750 1,305,000