COMMITMENTS & CONTINGENCIES (Details Narrative)	12 Months Ended
Dec. 31, 2017 USD ($) $ / shares
Business Combination Marketing Agreement [Member] \| Early Bird Capital [Member]
Description business combination	The Company will pay EBC a cash fee for such services upon consummation of the Business Combination in an amount equal to 4% of the total gross proceeds raised in the Initial Public Offering (exclusive of any applicable finders’ fee which might become payable) and the Company has the option to pay up to 25% of the 4% fee with shares of the Company’s Common Stock priced at $10.00 per share.
Share price (in dollars per share) \| $ / shares	$ 10.00
Oreva Agreement [Member]
Legal fees \| $	$ 2,000,000

With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionDescriptionOfAcquiredEntity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_LegalFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_TypeOfArrangementAxis=bhacu_BusinessCombinationMarketingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=bhacu_EarlyBirdCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=bhacu_OrevaAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: