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Investments (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Summary of Investments

		As of December 31, 2018
					Gross			Gross			Estimated
		Adjusted			Unrealized			Unrealized			Fair
		Cost			Gains			(Losses)			Value
Municipal securities		$	69,002		$	—		$	—		$	69,002
Total investments		$	69,002		$	—		$	—		$	69,002

		As of December 31, 2017
					Gross			Gross
		Adjusted			Unrealized			Unrealized			Estimated
		Cost			Gains			(Losses)			Fair Value
Municipal securities		$	84,768		$	—		$	(409)		$	84,359
Certificates of Deposit		$	4,915		$	—		$	(3)		$	4,912
Total investments		$	89,683		$	—		$	(412)		$	89,271

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- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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