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Financial Instruments (Tables) | 3 Months Ended
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Apr. 01, 2018
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 April 1, 2018 and December 31, 2017.
|  | April 1, 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 |  | $ | 155,543 |  |  | $ | — |  |  | $ | — |  |  | $ | 155,543 |
Cash equivalents |  |  | 306,710 |  |  |  | 175,620 |  |  |  | — |  |  |  | 482,330 |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | — |  |  |  | 611,946 |  |  |  | — |  |  |  | 611,946 |
Commercial paper |  |  | — |  |  |  | 252,158 |  |  |  | — |  |  |  | 252,158 |
Corporate debt securities |  |  | — |  |  |  | 44,218 |  |  |  | — |  |  |  | 44,218 |
U.S. government agency securities |  |  | — |  |  |  | 10,726 |  |  |  | — |  |  |  | 10,726 |
Certificates of deposit and time deposits |  |  | — |  |  |  | 4,824 |  |  |  | — |  |  |  | 4,824 |
Debt mutual funds |  |  | 2,741 |  |  |  | — |  |  |  | — |  |  |  | 2,741 |
Non-U.S. government securities |  |  | — |  |  |  | 559 |  |  |  | — |  |  |  | 559 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 22,613 |  |  |  | — |  |  |  | — |  |  |  | 22,613 |
|  | $ | 487,607 |  |  | $ | 1,100,051 |  |  | $ | — |  |  | $ | 1,587,658 |
Derivative assets |  |  | — |  |  |  | 12 |  |  |  | — |  |  |  | 12 |
Total |  | $ | 487,607 |  |  | $ | 1,100,063 |  |  | $ | — |  |  | $ | 1,587,670 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 15,581 |  |  | $ | 15,581 |
Derivative liabilities |  |  | — |  |  |  | 224 |  |  |  | — |  |  |  | 224 |
Total |  | $ | — |  |  | $ | 224 |  |  | $ | 15,581 |  |  | $ | 15,805 |
Reported as follows:
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 462,253 |  |  | $ | 175,620 |  |  | $ | — |  |  | $ | 637,873 |
Marketable securities |  |  | — |  |  |  | 860,526 |  |  |  | — |  |  |  | 860,526 |
Long-term marketable securities |  |  | 25,354 |  |  |  | 63,905 |  |  |  | — |  |  |  | 89,259 |
Prepayments |  |  | — |  |  |  | 12 |  |  |  | — |  |  |  | 12 |
Total |  | $ | 487,607 |  |  | $ | 1,100,063 |  |  | $ | — |  |  | $ | 1,587,670 |
Liabilities |  |  | . |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | $ | — |  |  | $ | 224 |  |  | $ | — |  |  | $ | 224 |
Contingent consideration |  |  | — |  |  |  | — |  |  |  | 15,581 |  |  |  | 15,581 |
Total |  | $ | — |  |  | $ | 224 |  |  | $ | 15,581 |  |  | $ | 15,805 |
|  | December 31, 2017 |
|  | 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 |  | $ | 197,955 |  |  | $ | — |  |  | $ | — |  |  | $ | 197,955 |
Cash equivalents |  |  | 206,335 |  |  |  | 25,553 |  |  |  | — |  |  |  | 231,888 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | — |  |  |  | 855,795 |  |  |  | — |  |  |  | 855,795 |
Commercial paper |  |  | — |  |  |  | 282,840 |  |  |  | — |  |  |  | 282,840 |
Certificates of deposit and time deposits |  |  | — |  |  |  | 167,342 |  |  |  | — |  |  |  | 167,342 |
Corporate debt securities |  |  | — |  |  |  | 133,186 |  |  |  | — |  |  |  | 133,186 |
Equity and debt mutual funds |  |  | 23,430 |  |  |  | — |  |  |  | — |  |  |  | 23,430 |
U.S. government agency securities |  |  | — |  |  |  | 10,726 |  |  |  | — |  |  |  | 10,726 |
Non-U.S. government securities |  |  | — |  |  |  | 586 |  |  |  | — |  |  |  | 586 |
|  | $ | 427,720 |  |  | $ | 1,476,028 |  |  | $ | — |  |  | $ | 1,903,748 |
Derivative assets |  |  | — |  |  |  | 389 |  |  |  | — |  |  |  | 389 |
Total |  | $ | 427,720 |  |  | $ | 1,476,417 |  |  | $ | — |  |  | $ | 1,904,137 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 45,102 |  |  | $ | 45,102 |
Derivative liabilities |  |  | — |  |  |  | 446 |  |  |  | — |  |  |  | 446 |
Total |  | $ | — |  |  | $ | 446 |  |  | $ | 45,102 |  |  | $ | 45,548 |
Reported as follows:
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 404,290 |  |  | $ | 25,553 |  |  | $ | — |  |  | $ | 429,843 |
Marketable securities |  |  | — |  |  |  | 1,347,979 |  |  |  | — |  |  |  | 1,347,979 |
Long-term marketable securities |  |  | 23,430 |  |  |  | 102,496 |  |  |  | — |  |  |  | 125,926 |
Prepayments |  |  | — |  |  |  | 389 |  |  |  | — |  |  |  | 389 |
Total |  | $ | 427,720 |  |  | $ | 1,476,417 |  |  | $ | — |  |  | $ | 1,904,137 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other accrued liabilities |  | $ | — |  |  | $ | 446 |  |  | $ | — |  |  | $ | 446 |
Contingent consideration |  |  | — |  |  |  | — |  |  |  | 24,497 |  |  |  | 24,497 |
Long-term contingent consideration |  |  | — |  |  |  | — |  |  |  | 20,605 |  |  |  | 20,605 |
Total |  | $ | — |  |  | $ | 446 |  |  | $ | 45,102 |  |  | $ | 45,548 |
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 April 1, 2018 and April 2, 2017 were as follows:
|  | For the Three Months Ended |
|  | April 1, 2018 |  |  | April 2, 2017 |
|  | (in thousands) |
Balance at beginning of period |  | $ | 45,102 |  |  | $ | 38,332 |
Payments (a) |  |  | (24,553 | ) |  |  | (1,050 | )
Fair value adjustment (b) |  |  | (4,968 | ) |  |  | 634 |
Balance at end of period |  | $ | 15,581 |  |  | $ | 37,916 |
(a) | 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 A/S (“Universal Robots”). In the three months ended April 2, 2017, Teradyne paid $1.1 million of contingent consideration for the earn-out in connection with the acquisition of Avionics Interface Technology, LLC (“AIT”).
(b) | 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. In the three months ended April 2, 2017, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $0.6 million primarily due to an increase in forecasted revenue and a decrease in the discount rate.
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 |  | April 1, 2018 Fair Value |  |  | Valuation Technique |  |  | Unobservable Inputs |  | Weighted Average |
|  | (in thousands) |  |  |  |  |  |  |  |  |
Contingent consideration (Universal Robots) |  | $ | 15,581 |  |  |  | Monte Carlo Simulation |  |  | Revenue for the period July 1, 2015—December 31, 2018 volatility |  |  | 13.0 | %
|  |  |  |  |  |  |  |  |  | Discount Rate |  |  | 3.8 | %
Schedule of Carrying Amounts and Fair Values of Financial Instruments | The carrying amounts and fair values of Teradyne’s financial instruments at April 1, 2018 and December 31, 2017 were as follows:
|  | April 1, 2018 |  |  | December 31, 2017 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 637,873 |  |  | $ | 637,873 |  |  | $ | 429,843 |  |  | $ | 429,843 |
Marketable securities |  |  | 949,785 |  |  |  | 949,785 |  |  |  | 1,473,905 |  |  |  | 1,473,905 |
Derivative assets |  |  | 12 |  |  |  | 12 |  |  |  | 389 |  |  |  | 389 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | 15,581 |  |  |  | 15,581 |  |  |  | 45,102 |  |  |  | 45,102 |
Derivative liabilities |  |  | 224 |  |  |  | 224 |  |  |  | 446 |  |  |  | 446 |
Convertible debt (1) |  |  | 369,421 |  |  |  | 700,626 |  |  |  | 365,987 |  |  |  | 659,525 |
(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 summarize the composition of available-for-sale marketable securities at April 1, 2018:
|  | April 1, 2018 |
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
U.S. Treasury securities |  | $ | 614,365 |  |  | $ | 19 |  |  | $ | (2,438 | ) |  | $ | 611,946 |  |  | $ | 610,938 |
Commercial paper |  |  | 252,579 |  |  |  | 17 |  |  |  | (438 | ) |  |  | 252,158 |  |  |  | 249,871 |
Corporate debt securities |  |  | 43,472 |  |  |  | 1,200 |  |  |  | (454 | ) |  |  | 44,218 |  |  |  | 17,742 |
U.S. government agency securities |  |  | 10,791 |  |  |  | — |  |  |  | (65 | ) |  |  | 10,726 |  |  |  | 10,726 |
Certificates of deposit and time deposits |  |  | 4,820 |  |  |  | 4 |  |  |  | — |  |  |  | 4,824 |  |  |  | — |
Debt mutual funds |  |  | 2,799 |  |  |  | — |  |  |  | (58 | ) |  |  | 2,741 |  |  |  | 1,679 |
Non-U.S. government securities |  |  | 559 |  |  |  | — |  |  |  | — |  |  |  | 559 |  |  |  | — |
|  | $ | 929,385 |  |  | $ | 1,240 |  |  | $ | (3,453 | ) |  | $ | 927,172 |  |  | $ | 890,956 |
Reported as follows:
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
Marketable securities |  | $ | 861,794 |  |  | $ | 54 |  |  | $ | (1,322 | ) |  | $ | 860,526 |  |  | $ | 847,446 |
Long-term marketable securities |  |  | 67,591 |  |  |  | 1,186 |  |  |  | (2,131 | ) |  |  | 66,646 |  |  |  | 43,510 |
|  | $ | 929,385 |  |  | $ | 1,240 |  |  | $ | (3,453 | ) |  | $ | 927,172 |  |  | $ | 890,956 |
The following table summarize the composition of available-for-sale marketable securities at December 31, 2017:
|  | December 31, 2017 |
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
U.S. Treasury securities |  | $ | 858,258 |  |  | $ | 72 |  |  | $ | (2,535 | ) |  | $ | 855,795 |  |  | $ | 850,163 |
Commercial paper |  |  | 283,009 |  |  |  | 18 |  |  |  | (187 | ) |  |  | 282,840 |  |  |  | 258,933 |
Certificates of deposit and time deposits |  |  | 167,523 |  |  |  | 6 |  |  |  | (187 | ) |  |  | 167,342 |  |  |  | 138,340 |
Corporate debt securities |  |  | 131,179 |  |  |  | 2,380 |  |  |  | (373 | ) |  |  | 133,186 |  |  |  | 91,010 |
Equity and debt mutual funds |  |  | 19,403 |  |  |  | 4,102 |  |  |  | (75 | ) |  |  | 23,430 |  |  |  | 1,723 |
U.S. government agency securities |  |  | 10,775 |  |  |  | — |  |  |  | (49 | ) |  |  | 10,726 |  |  |  | 10,726 |
Non-U.S. government securities |  |  | 582 |  |  |  | 4 |  |  |  | — |  |  |  | 586 |  |  |  | — |
|  | $ | 1,470,729 |  |  | $ | 6,582 |  |  | $ | (3,406 | ) |  | $ | 1,473,905 |  |  | $ | 1,350,896 |
Reported as follows:
|  | Cost |  |  | Unrealized Gain |  |  | Unrealized (Loss) |  |  | Fair Market Value |  |  | Fair Market Value of Investments with Unrealized Losses |
|  | (in thousands) |
Marketable securities |  | $ | 1,349,970 |  |  | $ | 38 |  |  | $ | (2,029 | ) |  | $ | 1,347,979 |  |  | $ | 1,288,844 |
Long-term marketable securities |  |  | 120,759 |  |  |  | 6,544 |  |  |  | (1,377 | ) |  |  | 125,926 |  |  |  | 62,052 |
|  | $ | 1,470,729 |  |  | $ | 6,582 |  |  | $ | (3,406 | ) |  | $ | 1,473,905 |  |  | $ | 1,350,896 |
Contractual Maturities of Investments in Debt Securities Held | The contractual maturities of investments in debt securities held at April 1, 2018 were as follows:
|  | April 1, 2018 |
|  | Cost |  |  | Fair Market Value |
|  | (in thousands) |
Due within one year |  | $ | 861,794 |  |  | $ | 860,526 |
Due after 1 year through 5 years |  |  | 10,173 |  |  |  | 10,058 |
Due after 5 years through 10 years |  |  | 14,583 |  |  |  | 13,823 |
Due after 10 years |  |  | 40,036 |  |  |  | 40,024 |
Total |  | $ | 926,586 |  |  | $ | 924,431 |
Schedule of Derivative Instruments in Statement of Financial Position at Fair Value | The following table summarizes the fair value of derivative instruments as of April 1, 2018 and December 31, 2017:
|  | Balance Sheet Location |  |  | April 1, 2018 |  |  | December 31, 2017 |
|  |  |  |  | (in thousands) |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts assets |  |  | Prepayments |  |  | $ | 12 |  |  | $ | 389 |
Foreign currency forward contracts liabilities |  |  | Other current liabilities |  |  |  | (224 | ) |  |  | (446 | )
Total derivatives |  |  |  |  |  | $ | (212 | ) |  | $ | (57 | )
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 April 1, 2018 and April 2, 2017.
|  | Location of Losses Recognized in Statement of Operations |  | For the Three Months Ended |
|  |  | April 1, 2018 |  |  | April 2, 2017 |
|  |  |  | (in thousands) |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | Other (income) expense, net |  | $ | 1,575 |  |  | $ | 1,011 |
(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 April 1, 2018 and April 2, 2017, net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $0.6 million and $1.5 million, respectively.

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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