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Accumulated Other Comprehensive (Loss) / Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) | The changes in accumulated other comprehensive (loss) income during the years ended December 31, were as follows:
| Balance at December 31, 2019 |  | Other comprehensive (loss) income |  | Tax effect |  | Balance at December 31, 2020
Foreign currency | $ | (28,204) |  |  | $ | 2,128 |  |  |  |  | $ | (26,076) |
Unrealized loss on intra-entity foreign currency transactions | (4,306) |  |  | 3,130 |  |  | (961) |  |  | (2,137) |
Unrealized holding gains (losses) on marketable debt securities | (751) |  |  | 751 |  |  | — |  |  | — |
Total | $ | (33,261) |  |  | $ | 6,009 |  |  | $ | (961) |  |  | $ | (28,213) |
| Balance at December 31, 2018 |  | Other comprehensive (loss) income |  | Tax effect |  | Balance at December 31, 2019
Foreign currency | $ | (26,436) |  |  | $ | (1,768) |  |  | $ | — |  |  | $ | (28,204) |
Unrealized income (loss) on intra-entity foreign currency transactions | (3,906) |  |  | (579) |  |  | 179 |  |  | (4,306) |
Unrealized holding gains (losses) on marketable debt securities | (41) |  |  | (710) |  |  | — |  |  | (751) |
Total | $ | (30,383) |  |  | $ | (3,057) |  |  | $ | 179 |  |  | $ | (33,261) |
| Balance at December 31, 2017 |  | Other comprehensive (loss) income |  | Tax effect |  | Balance at December 31, 2018
Foreign currency | $ | (20,284) |  |  | $ | (6,152) |  |  | $ | — |  |  | $ | (26,436) |
Unrealized (loss) income on intra-entity foreign currency transactions | (3,085) |  |  | (1,263) |  |  | 442 |  |  | (3,906) |
Unrealized holding gains (losses) on marketable debt securities | (4) |  |  | (37) |  |  | — |  |  | (41) |
Total | $ | (23,373) |  |  | $ | (7,452) |  |  | $ | 442 |  |  | $ | (30,383) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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