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Condensed Statement of Changes in Stockholders' Equity (USD $)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2014 $ 5,000,005us-gaap_StockholdersEquity $ 266us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 5,141,268us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (141,529)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance (In Shares) at Dec. 31, 2014   2,658,983us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Common stock subject to redemption 186,290hdrau_CommonStockSubjectToRedemptionValue 2hdrau_CommonStockSubjectToRedemptionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
186,288hdrau_CommonStockSubjectToRedemptionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0hdrau_CommonStockSubjectToRedemptionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Common stock subject to redemption (in Shares)   18,629hdrau_CommonStockSubjectToRedemptionShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Net loss (186,287)us-gaap_NetIncomeLoss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(186,287)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at Mar. 31, 2015 $ 5,000,008us-gaap_StockholdersEquity $ 268us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 5,327,556us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (327,816)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance (In Shares) at Mar. 31, 2015   2,677,612us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember