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U.S. Government Securities (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
U.S. Government Securities	$ 142,800,000	$ 146,900,000
Gross unrealized gain	3,900,000
Gross unrealized losses	0
Carrying Value
Debt Securities, Available-for-sale [Line Items]
Due in 1 year	4,842,000
Due in 1 year through 5 years	137,919,000
Total	142,761,000
Fair Value
Debt Securities, Available-for-sale [Line Items]
Due in 1 year	4,874,000
Due in 1 year through 5 years	141,790,000
Total	$ 146,664,000

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