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Organization and Summary of Significant Accounting Policies - Anti-dilutive Securities (Details) - shares
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable        
Net dilutive potential common shares issuable 579 665 748 757
On exercise of options where exercise price is greater than average market value for the period        
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable        
Net dilutive potential common shares issuable 534 374 725 471
On exercise of options and vesting of restricted stock units        
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable        
Net dilutive potential common shares issuable 45 290 23 286
Employee Stock Purchase Plan        
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable        
Net dilutive potential common shares issuable 0 1 0 0