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Initial Public Offering (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 27, 2015
Dec. 31, 2014
Initial Public Offering [Textual]      
Stock issued during the period sale of units shares. 115,000,000hrmn_StockIssuedDuringThePeriodSaleOfUnitsShares    
Common Stock, Par or Stated Value Per Share $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Sale of Stock, Price Per Share $ 10us-gaap_SaleOfStockPricePerShare    
Warrant [Member]      
Initial Public Offering [Textual]      
Common Stock, Par or Stated Value Per Share   $ 11.50us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
 
Shares Issued, Price Per Share   $ 0.01us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
 
Sale of Stock, Price Per Share   $ 17.50us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
 
IPO [Member]      
Initial Public Offering [Textual]      
Stock issued during the period sale of units shares.   11,500,000hrmn_StockIssuedDuringThePeriodSaleOfUnitsShares
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Share Price $ 0.01us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
$ 10.00us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Business combination percentage 50.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
100.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
IPO [Member] | Warrant [Member]      
Initial Public Offering [Textual]      
Business acquisition, effective date of acquisition   Mar. 23, 2016  
Business combination   Warrant upon 30 days' notice, only in the event that the last sale price of the shares of common stock is at least $17.50 per share for any 20 trading days within a 30-trading day period ending on the third day prior to the date on which notice of redemption is given. If the Company redeems the Warrants as described above, it will have the option to require any holder that wishes to exercise his Warrant to do so on a "cashless basis." In accordance with the warrant agreement relating to the Warrants sold in the Offering, the Company is only required to use its best efforts to file the registration statement covering the shares underlying the Warrants within 15 days after the closing of the Business Combination and to maintain the effectiveness of such registration statement.