XML 48 R22.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Accumulated Other Comprehensive Loss | 12 Months Ended
--- | ---
Dec. 31, 2019
Accumulated Other Comprehensive Loss [Abstract] |
Accumulated Other Comprehensive Loss |
15. | Accumulated Other Comprehensive Loss:
Comprehensive income includes net income, foreign currency translation adjustments, and net unrealized gains and losses on available-for-sale debt securities. See the Consolidated Statements of Comprehensive Income for the effect of the components of comprehensive income on the Company’s net income. The components of accumulated other comprehensive loss, net of tax, are as follows:
|  | Foreign currency translation adjustments |  |  | Net unrealized (gains) losses on marketable securities |  |  | Accumulated other comprehensive loss (income) |
Balance at December 31, 2017 |  | $ | 1,079 |  |  | $ | 126 |  |  | $ | 1,205 |
Net current period other comprehensive loss |  |  | 194 |  |  |  | (136 | ) |  |  | 58 |
Reclassifications |  |  | — |  |  |  | — |  |  |  | — |
Balance at December 31, 2018 |  |  | 1,273 |  |  |  | (10 | ) |  |  | 1,263 |
Net current period other comprehensive income |  |  | (709 | ) |  |  | 44 |  |  |  | (665 | )
Reclassifications |  |  | — |  |  |  | — |  |  |  | — |
Balance at December 31, 2019 |  | $ | 564 |  |  | $ | 34 |  |  | $ | 598 |

X
- Definition Accumulated Other Comprehensive Loss [Abstract] + References No definition available. + Details
Name: | onto_AccumulatedOtherComprehensiveLossAbstract
Namespace Prefix: | onto_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
Name: | us-gaap_ComprehensiveIncomeNoteTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration