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Deferred underwriting fee.

No definition available.

Name:	hvmc_DeferredUnderwritingFee
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Inception Date.

No definition available.

Name:	hvmc_InceptionDate
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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	instant

Initial public offering price per share.

No definition available.

Name:	hvmc_InitialPublicOfferingPricePerShare
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Maximum amount of dissolution expenses.

No definition available.

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Balance Type:	credit
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Maximum aggregate principal amount that may be borrowed by the Company under the unsecured promissory note with the Sponsor.

No definition available.

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Represents the minimum aggregate fair market value as a percentage of the net assets held in the Trust Account.

No definition available.

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Represents the price per unit placed into Trust Account.

No definition available.

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It represents the pro rata portion for redeem shares, price per share into trust account.

No definition available.

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Public per share, reduce the funds amount in trust account.

No definition available.

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Public per share, reduce the funds amount of trust assets.

No definition available.

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Percentage of outstanding shares that will be redeemed.

No definition available.

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Redemption of public shares, percentage

No definition available.

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Represents the threshold business days for redemption of public shares, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

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Represents the threshold percentage of outstanding voting securities of the target to be acquired by post-transaction company to complete business combination.

No definition available.

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Transaction costs.

No definition available.

Name:	hvmc_TransactionCosts
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Number of units issued.

No definition available.

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Working capital amount.

No definition available.

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Maximum amount of Working Capital Loans that may be converted into units upon consummation of a Business Combination.

No definition available.

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Period Type:	instant

Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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Exercise price per share or per unit of warrants or rights outstanding.

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Face amount or stated value per share of common stock.

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The price per share of the conversion feature embedded in the debt instrument.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of expense for cost associated with issuance of security by investment company. Includes, but is not limited to, legal fee pertaining to share offered for sale, registration fee, underwriting, printing prospectus, and initial fee for listing on exchange.

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Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

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Cash paid for expenses incurred during underwriting activities (the process to review insurance applications, evaluate risks, accept or reject applications, and determine the premiums to be charged) for insurance companies.

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

No definition available.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

No definition available.

Name:	us-gaap_SaleOfStockPricePerShare
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Per share or per unit amount of equity securities issued.

No definition available.

Name:	us-gaap_SharesIssuedPricePerShare
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Number of new stock issued during the period.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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