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The Business and Summary of Significant Accounting Policies - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Separate Account Investment [Line Items]    
Short-term investments $ 49,635 $ 96,574
Fair value, measurements, recurring    
Fair Value, Separate Account Investment [Line Items]    
Cash equivalents 34,816 11,854
Short-term investments 49,635 96,574
Total assets 84,451 108,428
Fair value, measurements, recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Separate Account Investment [Line Items]    
Cash equivalents 34,816 11,854
Short-term investments 34,227 22,493
Total assets 69,043 34,347
Fair value, measurements, recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Separate Account Investment [Line Items]    
Cash equivalents 0 0
Short-term investments 15,408 74,081
Total assets 15,408 74,081
Fair value, measurements, recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Separate Account Investment [Line Items]    
Cash equivalents 0 0
Short-term investments 0 0
Total assets 0 0
Money market funds | Fair value, measurements, recurring    
Fair Value, Separate Account Investment [Line Items]    
Cash equivalents 34,816 11,854
Money market funds | Fair value, measurements, recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Separate Account Investment [Line Items]    
Cash equivalents 34,816 11,854
Money market funds | Fair value, measurements, recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Separate Account Investment [Line Items]    
Cash equivalents 0 0
Money market funds | Fair value, measurements, recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Separate Account Investment [Line Items]    
Cash equivalents 0 0
U.S. treasury securities | Fair value, measurements, recurring    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 34,227 22,493
U.S. treasury securities | Fair value, measurements, recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 34,227 22,493
U.S. treasury securities | Fair value, measurements, recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 0 0
U.S. treasury securities | Fair value, measurements, recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 0 0
Commercial paper | Fair value, measurements, recurring    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 3,999 43,119
Commercial paper | Fair value, measurements, recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 0 0
Commercial paper | Fair value, measurements, recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 3,999 43,119
Commercial paper | Fair value, measurements, recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 0 0
Corporate bonds | Fair value, measurements, recurring    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 11,409 30,962
Corporate bonds | Fair value, measurements, recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 0 0
Corporate bonds | Fair value, measurements, recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments 11,409 30,962
Corporate bonds | Fair value, measurements, recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Separate Account Investment [Line Items]    
Short-term investments $ 0 $ 0