XML 50 R30.htm IDEA: XBRL DOCUMENT
v3.21.1

Fair Value Measurements - Summary of fair value measurement inputs and valuation techniques (Detail) | Dec. 31, 2020 yr | Sep. 30, 2020 yr | Jun. 30, 2020 yr | Mar. 30, 2020 yr | Dec. 31, 2019 yr | Sep. 30, 2019 yr | Sep. 06, 2019 yr
--- | --- | --- | --- | --- | --- | --- | ---
Public Warrants [Member] | Measurement Input, Share Price [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding |  |  |  |  |  |  | 9.82
Public Warrants [Member] | Measurement Input, Exercise Price [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding |  |  |  |  |  |  | 11.50
Public Warrants [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding |  |  |  |  |  |  | 5.38
Public Warrants [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding |  |  |  |  |  |  | 0.0860
Public Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding |  |  |  |  |  |  | 0.0185
Public Warrants [Member] | Measurement Input, Expected Dividend Rate [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding |  |  |  |  |  |  | 0
Public Warrants [Member] | Measurement Input Probability Of Completing A Business Combination [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding |  |  |  |  |  |  | 0.75
Private Placement Warrants [Member] | Measurement Input, Share Price [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding | 40.08 | 15.60 | 10.05 | 9.65 | 9.80 | 9.71 | 9.82
Private Placement Warrants [Member] | Measurement Input, Exercise Price [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding | 11.50 | 11.50 | 11.50 | 11.50 | 11.50 | 11.50 | 11.50
Private Placement Warrants [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding | 4.47 | 4.59 | 4.46 | 4.71 | 4.96 | 5.21 | 5.38
Private Placement Warrants [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding | 0.7430 | 0.4630 | 0.1510 | 0.1420 | 0.1050 | 0.1410 | 0.0860
Private Placement Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding | 0.0031 | 0.0026 | 0.0026 | 0.0036 | 0.0168 | 0.0155 | 0.0185
Private Placement Warrants [Member] | Measurement Input, Expected Dividend Rate [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding | 0 | 0 | 0 | 0 | 0 | 0 | 0
Private Placement Warrants [Member] | Measurement Input Probability Of Completing A Business Combination [Member] |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants and rights outstanding | 0.90 | 0.90 | 0.75 | 0.75 | 0.75 | 0.75 | 0.75

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=swea_PublicWarrantsMember
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_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_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=swea_PrivatePlacementWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |