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U.S. Government Securities (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
U.S. Government Securities	$ 142,300,000	$ 146,900,000
Gross unrealized gain	5,100,000
Gross unrealized losses	0
Carrying Value
Debt Securities, Available-for-sale [Line Items]
Due in 1 year	4,894,000
Due in 1 year through 5 years	137,374,000
Total	142,268,000
Fair Value
Debt Securities, Available-for-sale [Line Items]
Due in 1 year	4,931,000
Due in 1 year through 5 years	142,424,000
Total	$ 147,355,000

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