XML 118 R51.htm IDEA: XBRL DOCUMENT
v3.20.4

Convertible Loans - Schedule of Weighted-average Assumptions Valuation Method (Details) | Dec. 31, 2020 USD ($) $ / shares | Oct. 23, 2020 USD ($) $ / shares | Sep. 21, 2020 USD ($) $ / shares
--- | --- | --- | ---
Dividend Yields [Member] | Valuation Technique, Black-Scholes Option Pricing Model [Member] |  |  |
Fair value measurement of derivative instrument percentage | 0 | 0 | 0
Dividend Yields [Member] | Valuation Technique, Binomial Option Pricing Model [Member] |  |  |
Fair value measurement of derivative instrument percentage | 0 | 0 | 0
Risk Free Interest Rate [Member] | Valuation Technique, Black-Scholes Option Pricing Model [Member] |  |  |
Fair value measurement of derivative instrument percentage | 0.09 | 0.11 | 0.19
Risk Free Interest Rate [Member] | Valuation Technique, Black-Scholes Option Pricing Model [Member] | Minimum [Member] |  |  |
Fair value measurement of derivative instrument percentage | 0.10 | 0.12 | 0.12
Risk Free Interest Rate [Member] | Valuation Technique, Black-Scholes Option Pricing Model [Member] | Maximum [Member] |  |  |
Fair value measurement of derivative instrument percentage | 0.14 | 0.2 | 0.16
Expected Life [Member] | Valuation Technique, Black-Scholes Option Pricing Model [Member] |  |  |
Fair value measurement of derivative instrument term | 50 months 1 day | 82 months 6 days | 93 months
Volatility [Member] | Valuation Technique, Black-Scholes Option Pricing Model [Member] |  |  |
Fair value measurement of derivative instrument percentage | 48.06 | 51.96 | 51.96
Volatility [Member] | Valuation Technique, Binomial Option Pricing Model [Member] |  |  |
Fair value measurement of derivative instrument percentage | 48.06 | 51.96 | 51.96
Share Price [Member] | Valuation Technique, Black-Scholes Option Pricing Model [Member] |  |  |
Fair value of derivative instrument price | $ 8.61 | $ 5.88 | $ 6.72
Share Price [Member] | Valuation Technique, Binomial Option Pricing Model [Member] |  |  |
Fair value of derivative instrument price | 8.61 | 5.88 | 6.72
Exercise Price [Member] | Valuation Technique, Black-Scholes Option Pricing Model [Member] |  |  |
Fair value of derivative instrument price | $ 7.63 | $ 7.63 | $ 7.63
Fair Value [Member] | Valuation Technique, Black-Scholes Option Pricing Model [Member] |  |  |
Fair value of derivative instrument | $ | $ 47,499 | $ 6,457 | $ 15,208
Fair Value [Member] | Valuation Technique, Binomial Option Pricing Model [Member] |  |  |
Fair value of derivative instrument | $ | $ 77,381 | $ 15,167 | $ 26,824

X
- Definition Fair value of warrant price. + References No definition available. + Details
Name: | SAFO_FairValueOfWarrantPrice
Namespace Prefix: | SAFO_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_WarrantsAndRightsOutstandingMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedDividendRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=SAFO_ValuationTechniqueBlackScholesOptionPricingModelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=SAFO_ValuationTechniqueBinomialOptionPricingModelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputSharePriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExercisePriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputAppraisedValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |