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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis | The following table sets forth by fair value hierarchy Teradyne’s financial assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2020 and 2019:
|  | December 31, 2020 |
|  | Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 443,166 |  |  | $ | — |  |  | $ | — |  |  | $ | 443,166 |
Cash equivalents |  |  | 347,768 |  |  |  | 123,187 |  |  |  | — |  |  |  | 470,955 |
Available for sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | — |  |  |  | 258,304 |  |  |  | — |  |  |  | 258,304 |
Commercial paper |  |  | — |  |  |  | 254,413 |  |  |  | — |  |  |  | 254,413 |
Corporate debt securities |  |  | — |  |  |  | 83,615 |  |  |  | — |  |  |  | 83,615 |
Debt mutual funds |  |  | 8,565 |  |  |  | — |  |  |  | — |  |  |  | 8,565 |
U.S. government agency securities |  |  | — |  |  |  | 4,339 |  |  |  | — |  |  |  | 4,339 |
Certificates of deposit and time deposits |  |  | — |  |  |  | 979 |  |  |  | — |  |  |  | 979 |
Non-U.S. government securities |  |  | — |  |  |  | 625 |  |  |  | — |  |  |  | 625 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 29,420 |  |  |  | — |  |  |  | — |  |  |  | 29,420 |
Total |  | $ | 828,919 |  |  | $ | 725,462 |  |  | $ | — |  |  | $ | 1,554,381 |
Derivative assets |  |  | — |  |  |  | 95 |  |  |  | — |  |  |  | 95 |
Total |  | $ | 828,919 |  |  | $ | 725,557 |  |  | $ | — |  |  | $ | 1,554,476 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 7,227 |  |  | $ | 7,227 |
Derivative liabilities |  |  | — |  |  |  | 504 |  |  |  | — |  |  |  | 504 |
Total |  | $ | — |  |  | $ | 504 |  |  | $ | 7,227 |  |  | $ | 7,731 |
Reported as follows:
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 790,934 |  |  | $ | 123,187 |  |  | $ | — |  |  | $ | 914,121 |
Marketable securities |  |  | — |  |  |  | 522,280 |  |  |  | — |  |  |  | 522,280 |
Long-term marketable securities |  |  | 37,985 |  |  |  | 79,995 |  |  |  | — |  |  |  | 117,980 |
Prepayments and other current assets |  |  | — |  |  |  | 95 |  |  |  | — |  |  |  | 95 |
Total |  | $ | 828,919 |  |  | $ | 725,557 |  |  | $ | — |  |  | $ | 1,554,476 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | $ | — |  |  | $ | 504 |  |  | $ | — |  |  | $ | 504 |
Long-term contingent consideration |  |  | — |  |  |  | — |  |  |  | 7,227 |  |  |  | 7,227 |
Total |  | $ | — |  |  | $ | 504 |  |  | $ | 7,227 |  |  | $ | 7,731 |
|  | December 31, 2019 |
|  | Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 311,975 |  |  | $ | — |  |  | $ | — |  |  | $ | 311,975 |
Cash equivalents |  |  | 410,285 |  |  |  | 51,664 |  |  |  | — |  |  |  | 461,949 |
Available for sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  | — |  |  |  | 97,307 |  |  |  | — |  |  |  | 97,307 |
Commercial paper |  |  | — |  |  |  | 54,149 |  |  |  | — |  |  |  | 54,149 |
U.S. Treasury securities |  |  | — |  |  |  | 42,382 |  |  |  | — |  |  |  | 42,382 |
U.S. government agency securities |  |  | — |  |  |  | 9,952 |  |  |  | — |  |  |  | 9,952 |
Debt mutual funds |  |  | 6,888 |  |  |  | — |  |  |  | — |  |  |  | 6,888 |
Certificates of deposit and time deposits |  |  | — |  |  |  | 4,751 |  |  |  | — |  |  |  | 4,751 |
Non-U.S. government securities |  |  | — |  |  |  | 592 |  |  |  | — |  |  |  | 592 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 25,772 |  |  |  | — |  |  |  | — |  |  |  | 25,772 |
Total |  | $ | 754,920 |  |  | $ | 260,797 |  |  | $ | — |  |  | $ | 1,015,717 |
Derivative assets |  |  | — |  |  |  | 528 |  |  |  | — |  |  |  | 528 |
Total |  | $ | 754,920 |  |  | $ | 261,325 |  |  | $ | — |  |  | $ | 1,016,245 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 39,705 |  |  | $ | 39,705 |
Derivative liabilities |  |  | — |  |  |  | 203 |  |  |  | — |  |  |  | 203 |
Total |  | $ | — |  |  | $ | 203 |  |  | $ | 39,705 |  |  | $ | 39,908 |
Reported as follows:
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 722,260 |  |  | $ | 51,664 |  |  | $ | — |  |  | $ | 773,924 |
Marketable securities |  |  | — |  |  |  | 137,303 |  |  |  | — |  |  |  | 137,303 |
Long-term marketable securities |  |  | 32,660 |  |  |  | 71,830 |  |  |  | — |  |  |  | 104,490 |
Prepayments and other current assets |  |  | — |  |  |  | 528 |  |  |  | — |  |  |  | 528 |
Total |  | $ | 754,920 |  |  | $ | 261,325 |  |  | $ | — |  |  | $ | 1,016,245 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | $ | — |  |  | $ | 203 |  |  | $ | — |  |  | $ | 203 |
Contingent consideration |  |  | — |  |  |  | — |  |  |  | 9,106 |  |  |  | 9,106 |
Long-term contingent consideration |  |  | — |  |  |  | — |  |  |  | 30,599 |  |  |  | 30,599 |
Total |  | $ | — |  |  | $ | 203 |  |  | $ | 39,705 |  |  | $ | 39,908 |
Schedule of Changes in Fair Value of Level 3 Contingent Consideration | Changes in the fair value of Level 3 contingent consideration for the years ended December 31, 2020 and 2019 were as follows:
|  | Contingent Consideration |
|  | (in thousands) |
Balance at December 31, 2018 |  | $ | 70,543 |
Acquisition of AutoGuide |  |  | 23,976 |
Foreign currency impact |  |  | (967 | )
Payments (1) |  |  | (34,590 | )
Fair value adjustment (2) |  |  | (19,257 | )
Balance at December 31, 2019 |  |  | 39,705 |
Foreign currency impact |  |  | (355 | )
Payments (3) |  |  | (8,852 | )
Fair value adjustment (4) |  |  | (23,271 | )
Balance at December 31, 2020 |  | $ | 7,227 |
(1) | During the year ended December 31, 2019, Teradyne paid $30.8 million and $3.8 million of contingent consideration for the earn-outs in connection with the acquisitions of MiR and Universal Robots A/S (“Universal Robots”), respectively.
(2) | During the year ended December 31, 2019, the fair value of contingent consideration for the earn-out in connection with the acquisition of MiR was decreased by $22.2 million primarily due to a decrease in forecasted revenues partially offset by the impact from modification of the earn-out structure. During the year ended December 31, 2019, the fair value of contingent consideration for the earn-out in connection with the acquisition of AutoGuide was increased by $3.0 million primarily due to an increase in forecasted revenues
(3) | During the year ended December 31, 2020, Teradyne paid $8.9 million of contingent consideration for the earn-out in connection with the acquisition of MiR.
(4) | During the year ended December 31, 2020, the fair value of contingent consideration for the earn-out in connection with the acquisition of AutoGuide was decreased by $19.7 million primarily due to a decrease in forecasted revenues and earnings before interest and taxes . Teradyne has received a letter from the sellers of AutoGuide alleging non-compliance with the earn-out provisions of the AutoGuide acquisition agreement. Teradyne disputes the allegation of non-compliance. The ultimate amount of contingent consideration for the earn-outs in connection with the acquisition of AutoGuide may be affected by the outcome of the dispute. During the year ended December 31, 2020, the fair value of contingent consideration for the earn-out in connection with the acquisition of MiR was decreased by $3.5 million primarily due to a decrease in forecasted revenues.
Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument | The following table provides quantitative information associated with the fair value measurement of Teradyne’s Level 3 financial instrument:
Liability |  | December 31, 2020 Fair Value |  |  | Valuation Technique |  | Unobservable Inputs |  | Weighted Average |
|  | (in thousands) |  |  |  |  |  |  |  |
Contingent consideration (AutoGuide) |  | $ | 7,227 |  |  | Monte Carlo simulation |  | Revenue Volatility |  |  | 16.5% |
|  |  |  |  |  |  |  | Discount Rate |  |  | 1.0% |
Schedule of Carrying Amounts and Fair Values of Financial Instruments | The carrying amounts and fair values of Teradyne’s financial instruments at December 31, 2020 and 2019 were as follows:
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 914,121 |  |  | $ | 914,121 |  |  | $ | 773,924 |  |  | $ | 773,924 |
Marketable securities |  |  | 640,260 |  |  |  | 640,260 |  |  |  | 241,793 |  |  |  | 241,793 |
Derivative assets |  |  | 95 |  |  |  | 95 |  |  |  | 528 |  |  |  | 528 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | 7,227 |  |  |  | 7,227 |  |  |  | 39,705 |  |  |  | 39,705 |
Derivative liabilities |  |  | 504 |  |  |  | 504 |  |  |  | 203 |  |  |  | 203 |
Convertible debt (1) |  |  | 410,111 |  |  |  | 1,739,553 |  |  |  | 394,687 |  |  |  | 1,010,275 |
(1) | The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion features.
Schedule of Available-for-Sale Marketable Securities | The following tables summarize the composition of available-for-sale marketable securities at December 31, 2020 and 2019:
|  | December 31, 2020 |
|  | Available-for-Sale |  |  |  |
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
U.S. Treasury securities |  | $ | 257,132 |  |  | $ | 1,330 |  |  | $ | (158 | ) |  | $ | 258,304 |  |  | $ | 17,243 |
Commercial paper |  |  | 254,404 |  |  |  | 10 |  |  |  | (1 | ) |  |  | 254,413 |  |  |  | 12,173 |
Corporate debt securities |  |  | 76,129 |  |  |  | 7,539 |  |  |  | (53 | ) |  |  | 83,615 |  |  |  | 39,896 |
Debt mutual funds |  |  | 8,413 |  |  |  | 152 |  |  |  | — |  |  |  | 8,565 |  |  |  | — |
U.S. government agency securities |  |  | 4,294 |  |  |  | 46 |  |  |  | (1 | ) |  |  | 4,339 |  |  |  | 1,106 |
Certificates of deposit and time deposits |  |  | 979 |  |  |  | — |  |  |  | — |  |  |  | 979 |  |  |  | — |
Non-U.S. government securities |  |  | 625 |  |  |  | — |  |  |  | — |  |  |  | 625 |  |  |  | — |
|  | $ | 601,976 |  |  | $ | 9,077 |  |  | $ | (213 | ) |  | $ | 610,840 |  |  | $ | 70,418 |
Reported as follows:
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
Marketable securities |  | $ | 522,228 |  |  | $ | 92 |  |  | $ | (40 | ) |  | $ | 522,280 |  |  | $ | 61,806 |
Long-term marketable securities |  |  | 79,748 |  |  |  | 8,985 |  |  |  | (173 | ) |  |  | 88,560 |  |  |  | 8,612 |
|  | $ | 601,976 |  |  | $ | 9,077 |  |  | $ | (213 | ) |  | $ | 610,840 |  |  | $ | 70,418 |
|  | December 31, 2019 |
|  | Available-for-Sale |  |  |  |
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
Corporate debt securities |  | $ | 93,267 |  |  | $ | 4,081 |  |  | $ | (41 | ) |  | $ | 97,307 |  |  | $ | 2,009 |
Commercial paper |  |  | 54,124 |  |  |  | 26 |  |  |  | (1 | ) |  |  | 54,149 |  |  |  | 1,391 |
U.S. Treasury securities |  |  | 42,167 |  |  |  | 431 |  |  |  | (216 | ) |  |  | 42,382 |  |  |  | 17,556 |
U.S. government agency securities |  |  | 9,942 |  |  |  | 14 |  |  |  | (4 | ) |  |  | 9,952 |  |  |  | 3,043 |
Debt mutual funds |  |  | 6,753 |  |  |  | 135 |  |  |  | — |  |  |  | 6,888 |  |  |  | — |
Certificates of deposit and time deposits |  |  | 4,751 |  |  |  | — |  |  |  | — |  |  |  | 4,751 |  |  |  | — |
Non-U.S. government securities |  |  | 592 |  |  |  | — |  |  |  | — |  |  |  | 592 |  |  |  | — |
|  | $ | 211,596 |  |  | $ | 4,687 |  |  | $ | (262 | ) |  | $ | 216,021 |  |  | $ | 23,999 |
Reported as follows:
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
Marketable securities |  | $ | 137,144 |  |  | $ | 160 |  |  | $ | (1 | ) |  | $ | 137,303 |  |  | $ | 2,922 |
Long-term marketable securities |  |  | 74,452 |  |  |  | 4,527 |  |  |  | (261 | ) |  |  | 78,718 |  |  |  | 21,077 |
|  | $ | 211,596 |  |  | $ | 4,687 |  |  | $ | (262 | ) |  | $ | 216,021 |  |  | $ | 23,999 |
Contractual Maturities of Investments Held | The contractual maturities of investments in available-for-sale marketable securities held at December 31, 2020 were as follows:
|  | Cost |  |  | Fair Value |
|  | (in thousands) |
Due within one year |  | $ | 522,228 |  |  | $ | 522,280 |
Due after 1 year through 5 years |  |  | 24,829 |  |  |  | 25,245 |
Due after 5 years through 10 years |  |  | 13,030 |  |  |  | 14,183 |
Due after 10 years |  |  | 33,476 |  |  |  | 40,567 |
Total |  | $ | 593,563 |  |  | $ | 602,275 |
Schedule of Notional Amount of Derivatives | At December 31, 2020 and 2019, Teradyne had the following contracts to buy and sell non-U.S. currencies for U.S. dollars and other non-U.S. currencies with the following notional amounts:
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | Buy Position |  |  | Sell Position |  |  | Net Total |  |  | Buy Position |  |  | Sell Position |  |  | Net Total |
|  | (in millions) |
Japanese Yen |  | $ | (14.1 | ) |  | $ | — |  |  | $ | (14.1 | ) |  | $ | (29.3 | ) |  | $ | — |  |  | $ | (29.3 | )
Taiwan Dollar |  |  | (27.9 | ) |  |  | — |  |  |  | (27.9 | ) |  |  | (18.4 | ) |  |  | — |  |  |  | (18.4 | )
Korean Won |  |  | (5.3 | ) |  |  | — |  |  |  | (5.3 | ) |  |  | (10.7 | ) |  |  | — |  |  |  | (10.7 | )
British Pound Sterling |  |  | (1.0 | ) |  |  | — |  |  |  | (1.0 | ) |  |  | (3.8 | ) |  |  | — |  |  |  | (3.8 | )
Singapore Dollar |  |  | — |  |  |  | 52.3 |  |  |  | 52.3 |  |  |  | — |  |  |  | 25.3 |  |  |  | 25.3 |
Euro |  |  | — |  |  |  | 43.9 |  |  |  | 43.9 |  |  |  | — |  |  |  | 47.8 |  |  |  | 47.8 |
Philippine Peso |  |  | — |  |  |  | 5.0 |  |  |  | 5.0 |  |  |  | — |  |  |  | 5.2 |  |  |  | 5.2 |
Chinese Yuan |  |  | — |  |  |  | 3.4 |  |  |  | 3.4 |  |  |  | — |  |  |  | 4.4 |  |  |  | 4.4 |
Total |  | $ | (48.3 | ) |  | $ | 104.6 |  |  | $ | 56.3 |  |  | $ | (62.2 | ) |  | $ | 82.7 |  |  | $ | 20.5 |
Schedule of Derivative Instruments in Statement of Financial Position at Fair Value | The following table summarizes the fair value of derivative instruments as of December 31, 2020 and 2019:
|  | Balance Sheet Location |  | December 31, 2020 |  |  | December 31, 2019 |
|  |  |  | (in thousands) |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  | Prepayments |  | $ | 95 |  |  | $ | 528 |
Foreign exchange contracts |  | Other current liabilities |  |  | (504 | ) |  |  | (203 | )
Total derivatives |  |  |  | $ | (409 | ) |  | $ | 325 |
Schedule of Effect of Derivative Instruments on Statement of Operations Recognized | The following table summarizes the effect of derivative instruments in the statements of operations recognized for the years ended December 31, 2020, 2019, and 2018.
|  | Location of (Gains) Losses Recognized in Statement of Operations |  | December 31, 2020 |  |  | December 31, 2019 |  |  | December 31, 2018 |
|  |  |  | (in thousands) |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  | Other (income) expense, net |  | $ | 3,515 |  |  | $ | 5,960 |  |  | $ | 7,386 |
(1) | The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies.
(2) | For the years ended December 31, 2020, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $2.6 million.
(3) | For the year ended December 31, 2019 and 2018, net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $1.6 million and $2.5 million, respectively.

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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