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Investment Securities and Fair Value Measurements - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale investment securities	$ 114,509	$ 34,951
Gross Unrealized Gains	35	76
Gross Unrealized Losses	(25)	(1)
Estimated Fair Value	114,519	35,026
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale investment securities	49,442
Gross Unrealized Gains	4
Gross Unrealized Losses	(7)
Estimated Fair Value	49,439
Agency securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale investment securities	11,842	17,104
Gross Unrealized Gains	13	29
Gross Unrealized Losses	(7)	(1)
Estimated Fair Value	11,848	17,132
Treasury securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale investment securities	53,225	17,847
Gross Unrealized Gains	18	47
Gross Unrealized Losses	(11)	0
Estimated Fair Value	$ 53,232	$ 17,894

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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