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Available-for-Sale-Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost
Less than one year	$ 22,766	$ 37,850
Greater than one year	0	0
Cost	22,766	37,850
Estimated Fair Value
Less than one year	22,768	37,818
Greater than one year	0	0
Estimated fair value	$ 22,768	$ 37,818

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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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