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Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 50,057	$ 25
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	50,057	25
Money Market Mutual Funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	50,057	25
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 50,057	$ 25

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- Definition

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).

+ References

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