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Condensed Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Preferred Stock, Par or Stated Value Per Share $ 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 Issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred Stock, Shares Outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common Stock, Par or Stated Value Per Share $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized 29,000,000us-gaap_CommonStockSharesAuthorized 29,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued 2,677,612us-gaap_CommonStockSharesIssued 2,658,983us-gaap_CommonStockSharesIssued
Common Stock, Shares, Outstanding 2,677,612us-gaap_CommonStockSharesOutstanding 2,658,983us-gaap_CommonStockSharesOutstanding
Common stock redemption shares 7,322,388hdrau_CommonStockRedemptionShares 7,341,017hdrau_CommonStockRedemptionShares