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)

v3.21.2
Fair Value Measurements - Schedule of Amortized Cost (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost     $ 202,589,000 $ 67,590,000
Gross Unrealized Gains     5,000 1,000
Gross Unrealized Losses     (450,000) (45,000)
Fair Value     202,144,000 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     52,039,000 21,357,000
Gross Unrealized Gains     1,000 1,000
Gross Unrealized Losses     (97,000) (18,000)
Fair Value     51,943,000 21,340,000
Yankee bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost     3,062,000  
Gross Unrealized Gains     0  
Gross Unrealized Losses     (4,000)  
Fair Value     3,058,000  
Agency bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost     17,594,000  
Gross Unrealized Gains     0  
Gross Unrealized Losses     (4,000)  
Fair Value     17,590,000  
Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost     12,478,000  
Gross Unrealized Gains     0  
Gross Unrealized Losses     (67,000)  
Fair Value     12,411,000  
Commercial paper        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost     21,964,000 14,543,000
Gross Unrealized Gains     0 0
Gross Unrealized Losses     0 0
Fair Value     21,964,000 14,543,000
Asset-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost     26,630,000 14,546,000
Gross Unrealized Gains     0 0
Gross Unrealized Losses     (26,000) (8,000)
Fair Value     26,604,000 14,538,000
Corporate bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost     68,822,000 17,144,000
Gross Unrealized Gains     4,000 0
Gross Unrealized Losses     (252,000) (19,000)
Fair Value     $ 68,574,000 $ 17,125,000