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Fair Value Measurements Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Marketable Securities [Table Text Block]

Fair Value of Instruments Measured and Recognized at Fair Value

The following tables summarize the levels of fair value measurements of our financial assets:

			December 31, 2020												December 31, 2019
(in thousands)			Total			Level 1			Level 2						Total			Level 1			Level 2
Money market funds			$	551,213		$	551,213		$	—					$	363,075		$	363,075		$	—
U.S. Treasury bills			10,531			10,531			—						34,728			34,728			—
Municipal bonds			23,998			—			23,998						—			—			—
Total			$	585,742		$	561,744		$	23,998					$	397,803		$	397,803		$	—

Available-for-sale Securities [Table Text Block]

The following is a summary of our available-for-sale marketable securities:

(in thousands)			Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Estimated Fair Value
December 31, 2020
U.S. Treasury bills			$	10,530		$	1		$	—		$	10,531
Municipal bonds			23,994			8			(4)			23,998
December 31, 2019
U.S. Treasury bills			$	34,716		$	13		$	(1)		$	34,728

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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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- Definition

Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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