Investment Securities and Fair Value Measurements - Amortized Cost, Unrealized Gain (Loss) and Fair Value (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	$ 446,735
Unrealized Gains	106
Unrealized Losses	(257)
Total available-for-sale securities, Estimated Fair Value	446,584
U.S. Government Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	254,881
Total available-for-sale securities, Estimated Fair Value	254,757
U.S. Government Agency Bonds | Accumulated other comprehensive income (loss)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Losses	(211)
U.S. Treasury Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	186,496
Total available-for-sale securities, Estimated Fair Value	186,478
U.S. Treasury Bonds | Accumulated other comprehensive income (loss)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Gains	19
Unrealized Losses	(37)
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	5,358
Total available-for-sale securities, Estimated Fair Value	5,349
Corporate Debt Securities | Accumulated other comprehensive income (loss)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Gains	87
Unrealized Losses	$ (9)