Stockholders' Equity (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014	Mar. 27, 2015
Subsidiary, Sale of Stock [Line Items]
Preferred stock shares authorized	1,000,000us-gaap_PreferredStockSharesAuthorized	1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock par value	$ 0.0001	$ 0.0001
Preferred stock shares outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common stock shares authorized	27,500,000us-gaap_CommonStockSharesAuthorized	27,500,000us-gaap_CommonStockSharesAuthorized
Common stock par value	$ 0.0001	$ 0.0001
Common stock sold	$ 115,000,000
Common stock shares subject to possible conversion	10,585,784	10,585,784
Common stock shares issued	4,498,966us-gaap_CommonStockSharesIssued	3,026,250us-gaap_CommonStockSharesIssued
Common stock shares outstanding	4,498,966us-gaap_CommonStockSharesOutstanding	3,026,250us-gaap_CommonStockSharesOutstanding
IPO [Member]
Subsidiary, Sale of Stock [Line Items]
Common stock sold	$ 25,000
Common stock sold, shares	2,875,000
Offering price	$ 0.01		$ 10.00
Percentage of escrow share	50.00%
Common stock authorized a stock dividend outstanding	Effective November 7, 2014, the Company’s Board of Directors authorized a stock dividend of approximately 0.05 shares of common stock for each outstanding share of common stock.
Initial business combination description	The earlier of one year after the date of the consummation of an initial Business Combination and the date on which the closing price of the common stock exceeds $12.50 per share for any 20 trading days within a 30-trading day period following the consummation of an initial Business Combination.
Shares placed into an escrow account on the closing of the Offering	3,026,250
Business combination percentage	50.00%		100.00%
Company's initial stock redemption	100.00%
Common stock shares issued	15,084,750
Common stock shares outstanding	15,084,750

Stockholders' Equity (Details) (USD $)

3 Months Ended

Mar. 31, 2015

Dec. 31, 2014

Mar. 27, 2015

Subsidiary, Sale of Stock [Line Items]

Preferred stock shares authorized

1,000,000us-gaap_PreferredStockSharesAuthorized

Preferred stock par value

$ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare

Preferred stock shares outstanding

0us-gaap_PreferredStockSharesOutstanding

Common stock shares authorized

27,500,000us-gaap_CommonStockSharesAuthorized

Common stock par value

$ 0.0001us-gaap_CommonStockParOrStatedValuePerShare

Common stock sold

$ 115,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues

Common stock shares subject to possible conversion

10,585,784hrmn_CommonStockSharesSubjectToPossibleConversion

Common stock shares issued

4,498,966us-gaap_CommonStockSharesIssued

3,026,250us-gaap_CommonStockSharesIssued

Common stock shares outstanding

4,498,966us-gaap_CommonStockSharesOutstanding

3,026,250us-gaap_CommonStockSharesOutstanding

IPO [Member]

Subsidiary, Sale of Stock [Line Items]

Common stock sold

$ 25,000us-gaap_StockIssuedDuringPeriodValueNewIssues
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Common stock sold, shares

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Offering price

$ 0.01us-gaap_SharePrice
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$ 10.00us-gaap_SharePrice
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Percentage of escrow share

50.00%hrmn_EscrowSharePercentage
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Common stock authorized a stock dividend outstanding

Effective November 7, 2014, the Company’s Board of Directors authorized a stock dividend of approximately 0.05 shares of common stock for each outstanding share of common stock.

Initial business combination description

The earlier of one year after the date of the consummation of an initial Business Combination and the date on which the closing price of the common stock exceeds $12.50 per share for any 20 trading days within a 30-trading day period following the consummation of an initial Business Combination.

Shares placed into an escrow account on the closing of the Offering

3,026,250hrmn_SharesPlacedIntoAnEscrowAccountOnTheClosingOfTheOffering
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Business combination percentage

50.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
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100.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
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Company's initial stock redemption

100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
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= us-gaap_IPOMember

Common stock shares issued

15,084,750us-gaap_CommonStockSharesIssued
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= us-gaap_IPOMember

Common stock shares outstanding

15,084,750us-gaap_CommonStockSharesOutstanding
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= us-gaap_IPOMember

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Common stock outstanding description.

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Escrow share percentage.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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