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Marketable Securities - Maturities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Summary of maturities of marketable securities
Due within one year	$ 37,121,000
Due after one year through five years	37,678,000
Estimated Fair Value - Total	$ 74,799,000	$ 0

X

- Definition

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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