Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2020

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities

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

	March 31, 2020
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Allowance for Credit Losses		Estimated Fair Values
Marketable securities
Corporate bonds and notes	$	32,608	$	16	$	(272	)	$	—	$	32,352
Commercial paper		1,324		1		—			—		1,325
Total debt securities		33,932		17		(272	)		—		33,677
Money market funds		34,791		—		—			—		34,791
Marketable equity securities		3,405		—		(3,015	)		—		390
Total equity securities		38,196		—		(3,015	)		—		35,181
Total marketable securities	$	72,128	$	17	$	(3,287	)	$	—	$	68,858
Reported in:
Cash and cash equivalents										$	34,791
Available-for-sale debt securities											33,677
Equity securities											390
Total marketable securities										$	68,858

	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

Schedule of Gross Unrealized Losses on Investments

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

	Less Than 12 Months					12 Months or More					Total
March 31, 2020	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Corporate bonds and notes	$	21,256	$	(265	)	$	3,995	$	(7	)	$	25,251	$	(272	)
Total	$	21,256	$	(265	)	$	3,995	$	(7	)	$	25,251	$	(272	)

	Less Than 12 Months					12 Months or More					Total
December 31, 2019	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 March 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	$	23,548
Due in one to two years		10,129
Total	$	33,677

Summary of Notional and Fair Values of Derivative Instruments

The notional and fair values of all derivative instruments were as follows (in thousands):

Undesignated derivatives (foreign exchange contracts)	March 31, 2020		December 31, 2019
Assets
Other current assets	$	114	$	—
Total fair value	$	114	$	—
Total notional value	$	5,000	$	—