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Fair Value Measurements and Available for Sale Investments - Schedule of Unrealized Loss and Fair Values in a Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value   $ 23,594
Less than 12 Months, Gross Unrealized Losses   (6)
12 Months or Greater, Fair Value   0
12 Months or Greater, Gross Unrealized Losses   0
Fair Value   23,594
Gross Unrealized Losses   (6)
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value $ 3,630  
Less than 12 Months, Gross Unrealized Losses (1)  
12 Months or Greater, Fair Value 0  
12 Months or Greater, Gross Unrealized Losses 0  
Fair Value 3,630  
Gross Unrealized Losses $ (1)  
Commercial and corporate obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value   5,986
Less than 12 Months, Gross Unrealized Losses   (4)
12 Months or Greater, Fair Value   0
12 Months or Greater, Gross Unrealized Losses   0
Fair Value   5,986
Gross Unrealized Losses   (4)
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value   17,608
Less than 12 Months, Gross Unrealized Losses   (2)
12 Months or Greater, Fair Value   0
12 Months or Greater, Gross Unrealized Losses   0
Fair Value   17,608
Gross Unrealized Losses   $ (2)