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Redeemable Preferred Stock (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
May 08, 2013
Redeemable preferred stock      
Redeemable stock issued (in shares) 5,231us-gaap_TemporaryEquitySharesIssued 5,231us-gaap_TemporaryEquitySharesIssued  
Redeemable stock issued, par value (in dollars per share) $ 0.01us-gaap_TemporaryEquityParOrStatedValuePerShare $ 0.01us-gaap_TemporaryEquityParOrStatedValuePerShare  
Original issue price $ 2,595,400plug_TemporaryEquitySharesIssuedOriginalIssuePrice    
Conversion price per share $ 0.2343plug_ConvertiblePreferredStockConversionPrice    
Series C redeemable convertible preferred stock      
Redeemable preferred stock      
Dividend rate 8.00%us-gaap_PreferredStockDividendRatePercentage
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= us-gaap_SeriesCPreferredStockMember
   
Air Liquide | Series C redeemable convertible preferred stock      
Redeemable preferred stock      
Redeemable stock issued (in shares)     5,231us-gaap_TemporaryEquitySharesIssued
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= plug_AirLiquideMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember