Fair Value Measurements - Schedule of Amortized Cost (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	$ 199,464	$ 67,590
Gross Unrealized Gains	22	1
Gross Unrealized Losses	(923)	(45)
Fair Value	198,563	67,546
Accrued interest receivable	600	200
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	52,791	21,357
Gross Unrealized Gains	11	1
Gross Unrealized Losses	(138)	(18)
Fair Value	52,664	21,340
Yankee bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	6,175
Gross Unrealized Gains	1
Gross Unrealized Losses	(16)
Fair Value	6,160
Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	17,546
Gross Unrealized Gains	0
Gross Unrealized Losses	(16)
Fair Value	17,530
Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	12,440
Gross Unrealized Gains	0
Gross Unrealized Losses	(211)
Fair Value	12,229
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	17,694	14,543
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4)	0
Fair Value	17,690	14,543
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	27,620	14,546
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(86)	(8)
Fair Value	27,535	14,538
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	65,198	17,144
Gross Unrealized Gains	9	0
Gross Unrealized Losses	(452)	(19)
Fair Value	$ 64,755	$ 17,125