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Condensed Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Preferred stock par value $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock shares subject to possible conversion 10,585,784hrmn_CommonStockSharesSubjectToPossibleConversion 10,585,784hrmn_CommonStockSharesSubjectToPossibleConversion
Common stock par value $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Common stock shares authorized 27,500,000us-gaap_CommonStockSharesAuthorized 27,500,000us-gaap_CommonStockSharesAuthorized
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