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Fair Value of Financial Instruments Including Cash, Cash Equivalents and Investments - Schedule of Fair Value Levels, Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents: $ 59,920 $ 34,887  
Investments: 111,692 122,800 $ 50,000
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments: $ 111,692 $ 122,800  
Debt Securities, Held-to-maturity, Type [Extensible List] us-gaap:CertificatesOfDepositMember us-gaap:CertificatesOfDepositMember  
Total $ 140,888 $ 122,824  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1 Inputs)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total 29,196 24  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2 Inputs)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments: $ 111,692 $ 122,800  
Debt Securities, Held-to-maturity, Type [Extensible List] us-gaap:CertificatesOfDepositMember us-gaap:CertificatesOfDepositMember  
Total $ 111,692 $ 122,800  
Fair Value, Measurements, Recurring | Money Market Funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents: 29,196 24  
Fair Value, Measurements, Recurring | Money Market Funds | Quoted Prices in Active Markets for Identical Assets (Level 1 Inputs)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents: $ 29,196 $ 24