Annual report pursuant to Section 13 and 15(d)

Organization and Summary of Significant Accounting Policies (Assumptions Used To Calculate Fair Value) (Details)

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Organization and Summary of Significant Accounting Policies (Assumptions Used To Calculate Fair Value) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility, minimum 61.00% 61.00% 60.00%
Expected volatility, maximum 64.00% 67.00% 71.00%
Weighted-average volatility 62.00% 65.00% 65.00%
Expected dividends 0.00% 0.00% 0.00%
Risk-free rate, minimum 1.50% 1.60% 1.00%
Risk-free rate, maximum 1.90% 2.00% 1.90%
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 5 years 1 month 6 days 5 years 3 months 18 days 5 years
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 6 years 3 months 18 days 7 years 4 months 24 days 6 years 2 months 12 days