XML 55 R33.htm IDEA: XBRL DOCUMENT
v3.20.4

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 |

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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 + Details
Name: | us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration