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Investment in Tess (Shedule of Fair value shares) (Details) - Tess Inc [Member] | Apr. 10, 2019 USD ($) $ / shares shares
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Tess shares held by Riot Blockchain, Inc. | shares | 2,708,333
Per share fair value | $ / shares | $ 0.03
Fair value of Tess shares held by Riot Blockchain, Inc. | $ | $ 90,174

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- Definition Fair value of non-controlling interest shares held by the company. + References No definition available. + Details
Name: | riot_FairValueOfSharesHeldByParentCompany
Namespace Prefix: | riot_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Per share fair value used to value Tess shares held by company. + References No definition available. + Details
Name: | riot_PerShareFairValueUsedToValueSharesInTess
Namespace Prefix: | riot_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Shares held by parent company. + References No definition available. + Details
Name: | riot_SharesHeldByParentCompany
Namespace Prefix: | riot_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=riot_TessIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |