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Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2020

Marketable Securities

Schedule of amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security

		Amortized cost				Gross unrealized holding gains				Gross unrealized holding losses				Estimated fair value
June 30, 2020
Available-for-sale securities:
Corporate bonds and notes		$	1,916			$	37			$	(8	)		$	1,945
Municipal bonds			2,017				9				—				2,026
Total available-for-sale securities		$	3,933			$	46			$	(8	)		$	3,971

December 31, 2019
Available-for-sale securities:
Corporate bonds and notes		$	1,814			$	21			$	(3	)		$	1,832
Municipal bonds			2,707				5				(1	)			2,711
Total available-for-sale securities		$	4,521			$	26			$	(4	)		$	4,543

Schedule of maturities of marketable securities classified as available-for-sale securities

		Amortized cost				Estimated fair value
Due within one year		$	2,827			$	2,841
Due after one year through five years			1,106				1,130
Due after five years			—				—
Total available-for-sale securities		$	3,933			$	3,971

Schedule of available-for-sale marketable securities in a gross unrealized loss position

		Less than 12 months								More than 12 months								Total
		Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses
As of June 30, 2020
Corporate bonds and notes		$	189			$	8			$	—			$	—			$	189			$	8
Municipal bonds			—				—				—				—				—				—
Total		$	189			$	8			$	—			$	—			$	189			$	8