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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2019
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 March 31, 2019 and December 31, 2018.
|  | March 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 |  | $ | 222,714 |  |  | $ | — |  |  | $ | — |  |  | $ | 222,714 |
Cash equivalents |  |  | 186,520 |  |  |  | 74,494 |  |  |  | — |  |  |  | 261,014 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | — |  |  |  | 191,043 |  |  |  | — |  |  |  | 191,043 |
Commercial paper |  |  | — |  |  |  | 180,604 |  |  |  | — |  |  |  | 180,604 |
Corporate debt securities |  |  | — |  |  |  | 91,244 |  |  |  | — |  |  |  | 91,244 |
Certificates of deposit and time deposits |  |  | — |  |  |  | 11,496 |  |  |  | — |  |  |  | 11,496 |
U.S. government agency securities |  |  | — |  |  |  | 9,629 |  |  |  | — |  |  |  | 9,629 |
Debt mutual funds |  |  | 3,331 |  |  |  | — |  |  |  | — |  |  |  | 3,331 |
Non-U.S. government securities |  |  | — |  |  |  | 378 |  |  |  | — |  |  |  | 378 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 25,289 |  |  |  | — |  |  |  | — |  |  |  | 25,289 |
|  | $ | 437,854 |  |  | $ | 558,888 |  |  | $ | — |  |  | $ | 996,742 |
Derivative assets |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | 17 |
Total |  | $ | 437,854 |  |  | $ | 558,905 |  |  | $ | — |  |  | $ | 996,759 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 38,313 |  |  | $ | 38,313 |
Derivative liabilities |  |  | — |  |  |  | 291 |  |  |  | — |  |  |  | 291 |
Total |  | $ | — |  |  | $ | 291 |  |  | $ | 38,313 |  |  | $ | 38,604 |
Reported as follows:
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 409,234 |  |  | $ | 74,494 |  |  | $ | — |  |  | $ | 483,728 |
Marketable securities |  |  | — |  |  |  | 421,088 |  |  |  | — |  |  |  | 421,088 |
Long-term marketable securities |  |  | 28,620 |  |  |  | 63,306 |  |  |  | — |  |  |  | 91,926 |
Prepayments |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | 17 |
Total |  | $ | 437,854 |  |  | $ | 558,905 |  |  | $ | — |  |  | $ | 996,759 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | $ | — |  |  | $ | 291 |  |  | $ | — |  |  | $ | 291 |
Contingent consideration |  |  | — |  |  |  | — |  |  |  | 22,803 |  |  |  | 22,803 |
Long-term contingent consideration |  |  | — |  |  |  | — |  |  |  | 15,510 |  |  |  | 15,510 |
Total |  | $ | — |  |  | $ | 291 |  |  | $ | 38,313 |  |  | $ | 38,604 |
|  | December 31, 2018 |
|  | 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 |  | $ | 312,512 |  |  | $ | — |  |  | $ | — |  |  | $ | 312,512 |
Cash equivalents |  |  | 253,525 |  |  |  | 360,715 |  |  |  | — |  |  |  | 614,240 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | — |  |  |  | 109,721 |  |  |  | — |  |  |  | 109,721 |
Commercial paper |  |  | — |  |  |  | 86,117 |  |  |  | — |  |  |  | 86,117 |
Corporate debt securities |  |  | — |  |  |  | 40,020 |  |  |  | — |  |  |  | 40,020 |
U.S. government agency securities |  |  | — |  |  |  | 9,611 |  |  |  | — |  |  |  | 9,611 |
Certificates of deposit and time deposits |  |  | — |  |  |  | 7,604 |  |  |  | — |  |  |  | 7,604 |
Debt mutual funds |  |  | 3,187 |  |  |  | — |  |  |  | — |  |  |  | 3,187 |
Non-U.S. government securities |  |  | — |  |  |  | 376 |  |  |  | — |  |  |  | 376 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 21,191 |  |  |  | — |  |  |  | — |  |  |  | 21,191 |
|  | $ | 590,415 |  |  | $ | 614,164 |  |  | $ | — |  |  | $ | 1,204,579 |
Derivative assets |  |  | — |  |  |  | 79 |  |  |  | — |  |  |  | 79 |
Total |  | $ | 590,415 |  |  | $ | 614,243 |  |  | $ | — |  |  | $ | 1,204,658 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 70,543 |  |  | $ | 70,543 |
Derivative liabilities |  |  | — |  |  |  | 514 |  |  |  | — |  |  |  | 514 |
Total |  | $ | — |  |  | $ | 514 |  |  | $ | 70,543 |  |  | $ | 71,057 |
Reported as follows:
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 566,037 |  |  | $ | 360,715 |  |  | $ | — |  |  | $ | 926,752 |
Marketable securities |  |  | — |  |  |  | 190,096 |  |  |  | — |  |  |  | 190,096 |
Long-term marketable securities |  |  | 24,378 |  |  |  | 63,353 |  |  |  | — |  |  |  | 87,731 |
Prepayments |  |  | — |  |  |  | 79 |  |  |  | — |  |  |  | 79 |
Total |  | $ | 590,415 |  |  | $ | 614,243 |  |  | $ | — |  |  | $ | 1,204,658 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other accrued liabilities |  | $ | — |  |  | $ | 514 |  |  | $ | — |  |  | $ | 514 |
Contingent consideration |  |  | — |  |  |  | — |  |  |  | 34,865 |  |  |  | 34,865 |
Long-term contingent consideration |  |  | — |  |  |  | — |  |  |  | 35,678 |  |  |  | 35,678 |
Total |  | $ | — |  |  | $ | 514 |  |  | $ | 70,543 |  |  | $ | 71,057 |
Schedule of Changes in Fair Value of Level 3 Contingent Consideration | Changes in the fair value of Level 3 contingent consideration for the three months ended March 31, 2019 and April 1, 2018 were as follows:
|  | For the Three Months Ended |
|  | March 31, |  |  | April 1, |
|  | 2019 |  |  | 2018 |
|  | (in thousands) |
Balance at beginning of period |  | $ | 70,543 |  |  | $ | 45,102 |
Foreign currency impact |  |  | (610 | ) |  |  | — |
Payments (a) |  |  | (34,590 | ) |  |  | (24,553 | )
Fair value adjustment (b) |  |  | 2,970 |  |  |  | (4,968 | )
Balance at end of period |  | $ | 38,313 |  |  | $ | 15,581 |
(a) | In the three months ended March 31, 2019, Teradyne paid $ 30.8 million and $3.8 million of contingent consideration for the earn-outs in connection with the acquisition of MiR and Universal Robots A/S (“Universal Robots”), respectively. In the three months ended April 1, 2018, Teradyne paid $ 24.6 million of contingent consideration for the earn-out in connection with the acquisition of Universal Robots.
(b) | In the three months ended March 31, 2019, the fair value of contingent consideration for the earn-out in connection with the acquisition of MiR was increased by $ 3.0 million. In the three months ended April 1, 2018, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was decreased by $ 5.0 million, primarily due to a decrease in forecasted revenue.
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 instruments:
Liability |  | March 31, 2019 Fair Value |  |  | Valuation Technique |  |  | Unobservable Inputs |  |  | Weighted Average |
|  | (in thousands) |  |  |  |  |  |  |  |  |  |
Contingent consideration (MiR) |  | $ | 38,313 |  |  | Monte Carlo Simulation |  |  | Revenue volatility |  |  |  | 17.0 | %
|  |  |  |  |  |  |  |  | Discount Rate |  |  |  | 0.4 | %
Schedule of Carrying Amounts and Fair Values of Financial Instruments | The carrying amounts and fair values of Teradyne’s financial instruments at March 31, 2019 and December 31, 2018 were as follows:
|  | March 31, 2019 |  |  | December 31, 2018 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 483,728 |  |  | $ | 483,728 |  |  | $ | 926,752 |  |  | $ | 926,752 |
Marketable securities |  |  | 513,014 |  |  |  | 513,014 |  |  |  | 277,827 |  |  |  | 277,827 |
Derivative assets |  |  | 17 |  |  |  | 17 |  |  |  | 79 |  |  |  | 79 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | 38,313 |  |  |  | 38,313 |  |  |  | 70,543 |  |  |  | 70,543 |
Derivative liabilities |  |  | 291 |  |  |  | 291 |  |  |  | 514 |  |  |  | 514 |
Convertible debt (1) |  |  | 383,590 |  |  |  | 644,575 |  |  |  | 379,981 |  |  |  | 547,113 |
(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 table summarizes the composition of available-for-sale marketable securities at March 31, 2019:
|  | March 31, 2019 |
|  | 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 |  | $ | 191,715 |  |  | $ | 144 |  |  | $ | (816 | ) |  | $ | 191,043 |  |  | $ | 82,132 |
Commercial paper |  |  | 180,610 |  |  |  | 1 |  |  |  | (7 | ) |  |  | 180,604 |  |  |  | 11,237 |
Corporate debt securities |  |  | 90,402 |  |  |  | 1,343 |  |  |  | (501 | ) |  |  | 91,244 |  |  |  | 18,150 |
Certificates of deposit and time deposits |  |  | 11,497 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 11,496 |  |  |  | 4,419 |
U.S. government agency securities |  |  | 9,646 |  |  |  | 4 |  |  |  | (21 | ) |  |  | 9,629 |  |  |  | 4,101 |
Debt mutual funds |  |  | 3,255 |  |  |  | 76 |  |  |  | — |  |  |  | 3,331 |  |  |  | — |
Non-U.S. government securities |  |  | 378 |  |  |  | — |  |  |  | — |  |  |  | 378 |  |  |  | — |
|  | $ | 487,503 |  |  | $ | 1,569 |  |  | $ | (1,347 | ) |  | $ | 487,725 |  |  | $ | 120,039 |
Reported as follows:
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
Marketable securities |  | $ | 421,024 |  |  | $ | 126 |  |  | $ | (62 | ) |  | $ | 421,088 |  |  | $ | 91,100 |
Long-term marketable securities |  |  | 66,479 |  |  |  | 1,443 |  |  |  | (1,285 | ) |  |  | 66,637 |  |  |  | 28,939 |
|  | $ | 487,503 |  |  | $ | 1,569 |  |  | $ | (1,347 | ) |  | $ | 487,725 |  |  | $ | 120,039 |
The following table summarizes the composition of available-for-sale marketable securities at December 31, 2018:
|  | December 31, 2018 |
|  | Available-for-Sale |  |  |  |
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Value Market |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
U.S. Treasury securities |  | $ | 110,969 |  |  | $ | 112 |  |  | $ | (1,360 | ) |  | $ | 109,721 |  |  | $ | 75,040 |
Commercial paper |  |  | 86,130 |  |  |  | 13 |  |  |  | (26 | ) |  |  | 86,117 |  |  |  | 85,094 |
Corporate debt securities |  |  | 41,133 |  |  |  | 432 |  |  |  | (1,545 | ) |  |  | 40,020 |  |  |  | 24,767 |
U.S. government agency securities |  |  | 9,646 |  |  |  | 1 |  |  |  | (36 | ) |  |  | 9,611 |  |  |  | 7,077 |
Certificates of deposit and time deposits |  |  | 7,604 |  |  |  | — |  |  |  | — |  |  |  | 7,604 |  |  |  | — |
Debt mutual funds |  |  | 3,153 |  |  |  | 34 |  |  |  | — |  |  |  | 3,187 |  |  |  | — |
Non-U.S. government securities |  |  | 376 |  |  |  | — |  |  |  | — |  |  |  | 376 |  |  |  | — |
|  | $ | 259,011 |  |  | $ | 592 |  |  | $ | (2,967 | ) |  | $ | 256,636 |  |  | $ | 191,978 |
Reported as follows:
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Value Market |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
Marketable securities |  | $ | 190,100 |  |  | $ | 88 |  |  | $ | (92 | ) |  | $ | 190,096 |  |  | $ | 140,262 |
Long-term marketable securities |  |  | 68,911 |  |  |  | 504 |  |  |  | (2,875 | ) |  |  | 66,540 |  |  |  | 51,716 |
|  | $ | 259,011 |  |  | $ | 592 |  |  | $ | (2,967 | ) |  | $ | 256,636 |  |  | $ | 191,978 |
Contractual Maturities of Investments Held | The contractual maturities of investments in available-for-sale securities held at March 31, 2019 were as follows:
|  | March 31, 2019 |
|  | Cost |  |  | Fair Market Value |
|  | (in thousands) |
Due within one year |  | $ | 421,024 |  |  | $ | 421,088 |
Due after 1 year through 5 years |  |  | 9,325 |  |  |  | 9,343 |
Due after 5 years through 10 years |  |  | 14,026 |  |  |  | 13,659 |
Due after 10 years |  |  | 39,873 |  |  |  | 40,304 |
Total |  | $ | 484,248 |  |  | $ | 484,394 |
Schedule of Derivative Instruments in Statement of Financial Position at Fair Value | The following table summarizes the fair value of derivative instruments as of March 31, 2019 and December 31, 2018:
|  | Balance Sheet Location |  | March 31, 2019 |  |  | December 31, 2018 |
|  |  |  | (in thousands) |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  | Prepayments |  | $ | 17 |  |  | $ | 79 |
Foreign exchange contracts |  | Other current liabilities |  |  | (291 | ) |  |  | (514 | )
Total derivatives |  |  |  | $ | (274 | ) |  | $ | (435 | )
Schedule of Effect of Derivative Instruments on Statement of Operations Recognized | The following table summarizes the effect of derivative instruments recognized in the statement of operations for the three months ended March 31, 2019 and April 1, 2018.
|  | Location of Losses (Gains) |  | For the Three Months Ended |
|  | Recognized in |  | March 31, |  |  | April 1, |
|  | Statement of Operations |  | 2019 |  |  | 2018 |
|  |  |  | (in thousands) |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  | Other (income) expense, net |  | $ | 3,934 |  |  | $ | 1,575 |
(1) | The table does not reflect the corresponding gains and losses from the remeasurement of monetary assets and liabilities denominated in foreign currencies.
(2) | For the three months ended March 31, 2019 and April 1, 2018, net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $ 3.2 million and $ 0.6 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=109980867&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=109980867&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=109980867&loc=SL5624171-113959 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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