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Acquisition of ReliOn Inc (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Apr. 02, 2014
Preliminary allocation of the purchase price to the estimated fair value of the net assets acquired        
Gain on bargain purchase   $ (1,014,256)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount    
Unaudited pro forma financial information        
Revenue 65,361,494us-gaap_BusinessAcquisitionsProFormaRevenue   31,190,848us-gaap_BusinessAcquisitionsProFormaRevenue  
Net loss attributable to the Company (88,925,977)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss   (69,645,886)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss  
Basic and diluted loss per share (in dollars per share) $ (0.56)plug_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted   $ (0.90)plug_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted  
ReliOn        
Description of Business        
Purchase price   4,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
  4,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
Number of shares of common stock issued       530,504us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
Closing price of the company's stock       $ 7.54us-gaap_SharePrice
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
Preliminary allocation of the purchase price to the estimated fair value of the net assets acquired        
Cash and cash equivalents   414,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
   
Accounts receivable, net   315,975us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
   
Inventory   5,161,223us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
   
Prepaid expenses and other assets   88,894us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
   
Property and equipment   162,990us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
   
Identifiable intangibles   980,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
   
Accounts payable and accrued expenses   (1,682,782)plug_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayableAndAccruedExpenses
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
   
Note payable   (426,044)plug_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNotePayable
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
   
Total Net Assets Acquired   5,014,256us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
   
Gain on bargain purchase   (1,014,256)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
   
Acquisition consideration   $ 4,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember
  $ 4,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= plug_ReliOnIncMember