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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets:    
Securities $ 108,346 $ 91,400
Fair Value Measurements, Recurring Basis    
Assets:    
Cash and cash equivalents 34,900 52,000
Total assets measured at fair value 143,201 143,403
Fair Value Measurements, Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total assets measured at fair value 16,606 49,004
Fair Value Measurements, Recurring Basis | Significant Other Observable Inputs (Level 2)    
Assets:    
Total assets measured at fair value 126,595 94,399
Fair Value Measurements, Recurring Basis | Money market funds    
Assets:    
Cash and cash equivalents 16,606 49,004
Fair Value Measurements, Recurring Basis | Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents 16,606 49,004
Fair Value Measurements, Recurring Basis | Money market funds | Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents 0 0
Fair Value Measurements, Recurring Basis | U.S. Treasury securities    
Assets:    
Securities 79,249 60,623
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Securities 0 0
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Significant Other Observable Inputs (Level 2)    
Assets:    
Securities 79,249 60,623
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises    
Assets:    
Securities 4,537  
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Securities 0  
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Significant Other Observable Inputs (Level 2)    
Assets:    
Securities 4,537  
Fair Value Measurements, Recurring Basis | Corporate debt securities    
Assets:    
Securities 42,809 33,776
Fair Value Measurements, Recurring Basis | Corporate debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Securities 0 0
Fair Value Measurements, Recurring Basis | Corporate debt securities | Significant Other Observable Inputs (Level 2)    
Assets:    
Securities $ 42,809 $ 33,776