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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
Valuation and Qualifying Accounts | TERADYNE, INC. SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |  |  | Column F |
Description |  | Balance at Beginning of Period |  |  | Additions Charged to Cost and Expenses |  |  | Other |  |  | Deductions |  |  | Balance at End of Period |
|  | (in thousands) |
Valuation reserve deducted in the balance sheet from the asset to which it applies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 Allowance for doubtful account |  | $ | 1,736 |  |  | $ | 356 |  |  | $ | 32 |  |  | $ | 90 |  |  | $ | 2,034 |
2019 Allowance for doubtful account |  | $ | 1,673 |  |  | $ | 87 |  |  | $ | 28 |  |  | $ | 52 |  |  | $ | 1,736 |
2018 Allowance for doubtful account |  | $ | 2,219 |  |  | $ | — |  |  | $ | 20 |  |  | $ | 566 |  |  | $ | 1,673 |
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |  |  | Column F |
Description |  | Balance at Beginning of Period |  |  | Additions Charged to Cost and Expenses |  |  | Other |  |  | Deductions |  |  | Balance at End of Period |
|  | (in thousands) |
Valuation reserve deducted in the balance sheet from the asset to which it applies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 Inventory reserve |  | $ | 103,556 |  |  | $ | 17,534 |  |  | $ | (521 | ) |  | $ | 9,982 |  |  | $ | 110,587 |
2019 Inventory reserve |  | $ | 100,779 |  |  | $ | 15,244 |  |  | $ | (85 | ) |  | $ | 12,382 |  |  | $ | 103,556 |
2018 Inventory reserve |  | $ | 102,896 |  |  | $ | 11,242 |  |  | $ | 368 |  |  | $ | 13,727 |  |  | $ | 100,779 |
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |  |  | Column F |
Description |  | Balance at Beginning of Period |  |  | Additions Charged to Cost and Expenses |  |  | Other |  |  | Deductions |  |  | Balance at End of Period |
|  | (in thousands) |
Valuation reserve deducted in the balance sheet from the asset to which it applies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 Valuation allowance |  | $ | 77,177 |  |  | $ | 7,785 |  |  | $ | — |  |  | $ | — |  |  | $ | 84,962 |
2019 Valuation allowance |  | $ | 69,852 |  |  | $ | 7,325 |  |  | $ | — |  |  | $ | — |  |  | $ | 77,177 |
2018 Valuation allowance |  | $ | 63,919 |  |  | $ | 6,333 |  |  | $ | — |  |  | $ | 400 |  |  | $ | 69,852 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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Namespace Prefix: | srt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration