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Available-for-Sale Securities and Fair Value Measurements - Narrative (Details)
12 Months Ended
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Maximum maturity period 2 years
Weighted average maturity period 6 months
Minimum  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Long term marketable securities, remaining maturity 12 months
Maximum  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Long term marketable securities, remaining maturity 17 months