XML 134 R122.htm IDEA: XBRL DOCUMENT
v3.22.1

Fair Value Measurements (Details) - Schedule of fair value of warrant liabilities - Thunder Bridge Acquisition Il, Ltd.[Member] - USD ($) | 11 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020
Private Placement [Member] |  |  |
Fair Value Measurements (Details) - Schedule of fair value of warrant liabilities [Line Items] |  |  |
Fair value, beginning balance |  |  | $ 7,862,415
Initial Measurement on August 9, 2019 |  | 9,175,984 |
Change in valuation inputs or other assumptions | [1] | (1,313,569) | 25,580,629
Fair value, ending balance |  | 7,862,415 | 33,443,044
Public [Member] |  |  |
Fair Value Measurements (Details) - Schedule of fair value of warrant liabilities [Line Items] |  |  |
Fair value, beginning balance |  |  | 15,525,000
Initial Measurement on August 9, 2019 |  | 17,250,000 |
Change in valuation inputs or other assumptions | [1] | (1,725,000) | 48,213,750
Fair value, ending balance |  | 15,525,000 | 63,738,750
Warrant Liabilities [Member] |  |  |
Fair Value Measurements (Details) - Schedule of fair value of warrant liabilities [Line Items] |  |  |
Fair value, beginning balance |  |  | 23,387,415
Initial Measurement on August 9, 2019 |  | 26,425,984 |
Change in valuation inputs or other assumptions | [1] | (3,038,569) | 73,794,379
Fair value, ending balance |  | $ 23,387,415 | $ 97,181,794
[1] | Due to the use of quoted prices in an active market (Level 1) and the use of observable inputs for similar assets or liabilities (Level 2) to measure the fair values of the Public Warrants and Private Placement Warrants, respectively, subsequent to initial measurement, the Company had transfers out of Level 3 totaling approximately $23.4 million during the period from August 9, 2019 through December 31, 2019.

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

X
- Definition Amount of value is initial measurement. + References No definition available. + Details
Name: | indi_InitialMeasurement
Namespace Prefix: | indi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of asset after deduction of liability. + References No definition available. + Details
Name: | us-gaap_FairValueNetAssetLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=indi_THUNDERBRIDGEACQUISITIONIILTDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=indi_PublicWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=indi_WarrantLiablitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |