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Company and Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - Equity Incentive 2011 Plan [Member]
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Significant Accounting Policies [Line Items]    
Expected term (in years) 5 years 6 years
Weighted average volatility (percentage) 120.48% 120.18%
Weighted average risk free interest rate (percentage) 1.70% 0.98%
Expected dividends   0.00%
Weighted-average expected forfeiture rate (percentage) 37.00% 11.74%