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Consolidated Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash Flows From Operating Activities:    
Net loss attributable to the Company $ (11,051,821)us-gaap_NetIncomeLoss $ (75,857,099)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property, plant and equipment, and investment in leased property 475,194us-gaap_DepreciationAndAmortization 457,735us-gaap_DepreciationAndAmortization
Amortization of intangible assets 608,444us-gaap_AmortizationOfIntangibleAssets 565,944us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation 1,697,130us-gaap_ShareBasedCompensation 648,750us-gaap_ShareBasedCompensation
Change in fair value of common stock warrant liability (1,768,795)plug_ChangeInFairValueOfCommonStockWarrantLiability 68,433,468plug_ChangeInFairValueOfCommonStockWarrantLiability
Changes in operating assets and liabilities that provide (use) cash, net of effects of acquisition:    
Accounts receivable 8,323,925us-gaap_IncreaseDecreaseInAccountsReceivable 87,084us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory (7,357,314)us-gaap_IncreaseDecreaseInInventories (1,537,404)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets (901,606)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (945,646)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Note receivable 15,919us-gaap_IncreaseDecreaseInNotesReceivableCurrent 15,465us-gaap_IncreaseDecreaseInNotesReceivableCurrent
Accounts payable, accrued expenses, product warranty reserve and other liabilities (3,160,055)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (1,115,631)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue (525,857)us-gaap_IncreaseDecreaseInDeferredRevenue 360,324us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash used in operating activities (13,644,836)us-gaap_NetCashProvidedByUsedInOperatingActivities (8,887,010)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows From Investing Activities:    
Purchase of property, plant and equipment (229,459)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (286,451)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash (used in) provided by investing activities (229,459)us-gaap_NetCashProvidedByUsedInInvestingActivities (286,451)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows From Financing Activities:    
Change in restricted cash (718,181)us-gaap_IncreaseDecreaseInRestrictedCash  
Proceeds from exercise of warrants   18,311,658us-gaap_ProceedsFromWarrantExercises
Proceeds from issuance of common stock and warrants   52,400,005us-gaap_ProceedsFromIssuanceOfCommonStock
Common stock issuance costs   (3,120,762)plug_PaymentsOfCommonStockIssuanceCosts
Proceeds from exercise of stock options 133,167us-gaap_ProceedsFromStockOptionsExercised  
Principal payments on obligations under capital lease and finance obligation (208,552)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (187,106)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Net cash provided by financing activities (793,566)us-gaap_NetCashProvidedByUsedInFinancingActivities 67,403,795us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash   (25,206)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Increase (decrease) in cash and cash equivalents (14,667,861)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 58,230,334us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 146,205,071us-gaap_CashAndCashEquivalentsAtCarryingValue 5,026,523us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 131,537,210us-gaap_CashAndCashEquivalentsAtCarryingValue 63,231,651us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid for interest $ 90,594us-gaap_InterestPaid $ 115,130us-gaap_InterestPaid