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RELATED PARTY BALANCES AND TRANSACTIONS (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Other receivables - related party |  | $ 12,036
Lin Zhao |  |
Other receivables - related party | 0 | 3,419
Liang Yuan |  |
Other receivables - related party | $ 0 | $ 8,617

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- Definition Amount, before allowance, of receivables classified as other, due within one year or the operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bhat_LinZhaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bhat_LiangYuanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |