Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Amortized Cost (Details)

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Fair Value Measurements - Schedule of Amortized Cost (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized Cost $ 190,915,000   $ 67,590,000
Gross Unrealized Gains 1,000   1,000
Gross Unrealized Losses (206,000)   (45,000)
Fair Value 190,710,000   67,546,000
Accrued interest receivable 500,000   200,000
Realized gains (losses) on marketable securities 0 $ 0  
U.S. Treasury securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized Cost 51,745,000   21,357,000
Gross Unrealized Gains 1,000   1,000
Gross Unrealized Losses (43,000)   (18,000)
Fair Value 51,703,000   21,340,000
Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized Cost 22,187,000   14,543,000
Gross Unrealized Gains 0   0
Gross Unrealized Losses 0   0
Fair Value 22,187,000   14,543,000
Asset-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized Cost 21,612,000   14,546,000
Gross Unrealized Gains 0   0
Gross Unrealized Losses (15,000)   (8,000)
Fair Value 21,597,000   14,538,000
Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortized Cost 95,371,000   17,144,000
Gross Unrealized Gains 0   0
Gross Unrealized Losses (148,000)   (19,000)
Fair Value $ 95,223,000   $ 17,125,000