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Organization and Plan of Business Operations (Details) (USD $)
0 Months Ended 3 Months Ended
Mar. 27, 2015
Mar. 31, 2015
Dec. 31, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Sale of public offering price per share   $ 10.20hrmn_SaleOfPublicOfferingPricePerShare  
Deferred underwriting expenses   $ 926,786us-gaap_PaymentsForUnderwritingExpense  
Percentage of fair market value   92.05%us-gaap_FairValueInputsControlPremium  
Intangible assets, net   5,000,001us-gaap_FiniteLivedIntangibleAssetsNet  
Initial business combination, description (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem 100% of the outstanding public shares and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining holders of common stock and the Company's board of directors, dissolve and liquidate. If the Company is unable to consummate an initial Business Combination and is forced to redeem 100% of the outstanding public shares for a pro rata portion of the funds held in the Trust Account, each holder will receive a full pro rata portion of the amount then in the Trust Account, plus any pro rata interest earned on the funds held in the Trust Account and not released to the Company to pay any of its taxes. (i) not to convert any shares of common stock included therein into the right to receive cash from the Trust Account in connection with a stockholder vote to approve the proposed initial Business Combination and (ii) that the shares of common stock included therein shall not participate in any liquidating distribution upon winding up if a Business Combination is not consummated. Additionally, the holders have agreed not to transfer, assign or sell any of the Private Units or underlying securities (except to certain permitted transferees) until the completion of the initial Business Combination.  
Common stock, value   450us-gaap_CommonStockValue 303us-gaap_CommonStockValue
Common stock shares subject to possible conversion   10,585,784hrmn_CommonStockSharesSubjectToPossibleConversion 10,585,784hrmn_CommonStockSharesSubjectToPossibleConversion
IPO [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Offering shares closed 11,500,000hrmn_OfferingSharesClosed
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
3,026,250hrmn_OfferingSharesClosed
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Offering share closed, Value 117,300,000hrmn_OfferingShareValueClosed
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Exercise of over-allotment option 1,500,000us-gaap_OptionIndexedToIssuersEquityShares
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Sale of public offering price per share 10.00hrmn_SaleOfPublicOfferingPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Proceeds from private placement 115,000,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Cash received from private placement 112,489,895hrmn_CashReceivedFromPrivatePlacement
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Transaction costs 2,510,105us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Deferred underwriting expenses 4,325,000us-gaap_PaymentsForUnderwritingExpense
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Maturity date, description 180 days or less.    
Percentage of fair market value 80.00%us-gaap_FairValueInputsControlPremium
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Costs related to private placement 5,585,000hrmn_CostsRelatedToPrivatePlacement
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Sale of stock, Description   (i) warrants sold in the Initial Public Offering to purchase 11,500,000 shares of the Company and (ii) warrants sold in the Private Units to purchase 558,500 shares of the Company, in the calculation of diluted loss per share, since the exercise of the warrants is contingent on the occurrence of future events.  
Chief Executive Officer [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Sale of public offering price per share   $ 10.20hrmn_SaleOfPublicOfferingPricePerShare
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
 
Common stock, value   $ 500,000us-gaap_CommonStockValue
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember