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Investment Securities and Fair Value Measurements - Available-for-sale Investments, by Remaining Contract Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 102,950	$ 28,197
Due after one year through three years	11,559	6,754
Total available-for-sale investment securities	114,509	34,951
Estimated Fair Value
Due in one year or less	102,978	28,256
Due after one year through three years	11,541	6,770
Total available-for-sale investment securities	$ 114,519	$ 35,026

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Amortized cost of 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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