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Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2020

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities

The following is a summary of marketable securities at December 31, 2020 and December 31, 2019 (in thousands):

		December 31, 2020
		Cost				Gross Unrealized Gains				Gross Unrealized Losses				Allowance for Credit Losses				Estimated Fair Values
Marketable securities
Corporate bonds and notes		$	69,973			$	29			$	(42	)		$	—			$	69,960
Commercial paper			15,991				—				(4	)			—				15,987
Treasury and agency notes and bills			32,299				—				—				—				32,299
Total debt securities			118,263				29				(46	)			—				118,246
Money market funds			3,849				—				—				—				3,849
Total equity securities			3,849				—				—				—				3,849
Total marketable securities		$	122,112			$	29			$	(46	)		$	—			$	122,095
Reported in:
Cash and cash equivalents																		$	35,148
Available-for-sale debt securities (1)																			86,947
Total marketable securities																		$	122,095

(1) Amortized cost related to the balance reported as AFS debt securities was $86,963.

		December 31, 2019
		Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Values
Marketable securities
Corporate bonds and notes		$	41,730			$	29			$	(13	)		$	41,746
Commercial paper			4,052				4				—				4,056
Total debt securities			45,782				33				(13	)			45,802
Money market funds			2,601				—				—				2,601
Marketable equity securities			3,405				—				(2,281	)			1,124
Total equity securities			6,006				—				(2,281	)			3,725
Total marketable securities		$	51,788			$	33			$	(2,294	)		$	49,527
Reported in:
Cash and cash equivalents														$	2,601
Available-for-sale debt securities															45,802
Equity securities															1,124
Total marketable securities														$	49,527

Fair Value and Gross Unrealized Losses Related to Individual Available-for-Sale Debt Securities

The following table summarizes the fair value and gross unrealized losses related to individual AFS debt securities at December 31, 2020 and 2019, which have been in a continuous unrealized loss position, aggregated by investment category and length of time (in thousands):

December 31, 2020		Less Than 12 Months								12 Months or More								Total
		Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses
Corporate bonds and notes		$	53,137			$	(42	)		$	—			$	—			$	53,137			$	(42	)
Commercial paper			12,988				(4	)			—				—				12,988				(4	)
Total		$	66,125			$	(46	)		$	—			$	—			$	66,125			$	(46	)

December 31, 2019		Less Than 12 Months								12 Months or More								Total
		Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses
Corporate bonds and notes		$	20,031			$	(10	)		$	8,753			$	(3	)		$	28,784			$	(13	)
Total		$	20,031			$	(10	)		$	8,753			$	(3	)		$	28,784			$	(13	)

Estimated Fair Value of Marketable Debt Securities by Contractual Maturity

The estimated fair value of marketable debt securities by contractual maturity at December 31, 2020 is shown below (in thousands). Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.

		Estimated Fair Value
Due in one year or less		$	77,263
Due in one to two years			40,983
Due in two to three years			—
Total		$	118,246

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For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563

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