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v3.20.4

Schedule of Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
Schedule of Valuation and Qualifying Accounts |
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |
|  | Balance at beginning of period |  |  | Charged to costs and expenses |  |  | Charged to other accounts |  |  | Deductions |  |  | Balance at end of period |
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2020 |  | $ | 209 |  |  | $ | (11 | ) |  | $ | 2 |  |  | $ |  |  |  | $ | 200 |
Year ended December 31, 2019 |  | $ | 232 |  |  | $ | (16 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | 209 |
Year ended December 31, 2018 |  | $ | 232 |  |  | $ | 13 |  |  | $ | (9 | ) |  | $ | (4 | ) |  | $ | 232 |
Allowance in respect of carryforward tax losses and deductions that may not be utilized: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2020 |  | $ | 1,974 |  |  | $ | 670 |  |  | $ | — |  |  | $ | (97 | ) |  | $ | 2,547 |
Year ended December 31, 2019 |  | $ | 1,633 |  |  | $ | 555 |  |  | $ | — |  |  | $ | (214 | ) |  | $ | 1,974 |
Year ended December 31, 2018 |  | $ | 1,504 |  |  | $ | 407 |  |  | $ | 5 |  |  | $ | (283 | ) |  | $ | 1,633 |

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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