XML 104 R71.htm IDEA: XBRL DOCUMENT
v3.21.2

Fair Value Measurements - Summary of Fair Value Measurements (Detail) - Fair Value, Recurring [Member] - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Marketable securities held in Trust Account |  | $ 414,228,281
Fair Value, Inputs, Level 1 [Member] | Public Warrant [Member] |  |
Liabilities: |  |
Warrant Liability | $ 17,990,000 | 35,604,000
Fair Value, Inputs, Level 3 [Member] |  |
Liabilities: |  |
FPA Liability | 1,650,000 | 4,225,000
Fair Value, Inputs, Level 3 [Member] | Private Placement Warrant [Member] |  |
Liabilities: |  |
Warrant Liability | $ 15,111,600 | $ 17,990,000

X
- Definition FPA liability fair value disclosure. + References No definition available. + Details
Name: | heccu_FpaLiabilityFairValueDisclosure
Namespace Prefix: | heccu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Marketable securities held in trust fair value disclosure. + References No definition available. + Details
Name: | heccu_MarketableSecuritiesHeldInTrustFairValueDisclosure
Namespace Prefix: | heccu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Warrants and rights outstanding fair value disclosure. + References No definition available. + Details
Name: | heccu_WarrantsAndRightsOutstandingFairValueDisclosure
Namespace Prefix: | heccu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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