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Allowance Accounts (Tables) | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Summary of activity in valuation accounts | The following table sets forth the activity in our valuation accounts for each of the three years in the period ended December 31, 2020 (in thousands):
| Allowance for Credit Losses |  | Deferred Tax Asset Valuation Allowance
Balance at December 31, 2017 | $ | 2,752 |  |  | $ | 12,337 |
Deductions (1) | (2,752) |  |  | — |
Adjustments (2) | — |  |  | 5,603 |
Balance at December 31, 2018 | — |  |  | 17,940 |
Adjustments (2) | — |  |  | 691 |
Balance at December 31, 2019 | — |  |  | 18,631 |
Additions (3) | 2,684 |  |  | — |
Adjustments (2) (4) | 785 |  |  | 1,091 |
Balance at December 31, 2020 | $ | 3,469 |  |  | $ | 19,722 |
(1)The decrease in allowance for credit losses reflects the write-offs of accounts receivable that are either settled or deemed uncollectible (2)The increase in valuation allowance primarily reflects additional net operating losses in our Robotics segment in the U.K. for which insufficient future taxable income exists to offset the losses. (3)The additions in allowance for credit losses reflect credit loss reserves during 2020. (4)The adjustment in allowance for credit losses reflects provision for current expected credit losses upon the adoption of ASU No. 2016-13 on January 1, 2020.

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- References No definition available. + Details
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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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