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Organization and Summary of Significant Accounting Policies - Anti-dilutive Securities (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable    
Net dilutive potential common shares issuable 452 916
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 311 916
On exercise of options    
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable    
Net dilutive potential common shares issuable 141 0