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Company and Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - Equity Incentive 2011 Plan [Member]
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Significant Accounting Policies [Line Items]    
Expected term (in years) 6 years 6 years
Weighted average volatility (percentage) 101.92% 63.37%
Weighted average risk free interest rate (percentage) 1.71% 2.52%
Expected dividends 0.00% 0.00%
Weighted-average expected forfeiture rate (percentage) 15.32% 7.82%