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Fair value measurements (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities $ 168,741,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent $ 102,327,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
Marketable securities with contractual maturity of one year or less 126,500,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Marketable securities with contractual maturity of one to two years 42,200,000gpro_AvailableforsaleSecuritiesDebtMaturitiesYearOneThroughTwoFairValue  
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 16,618,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
82,968,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Marketable securities 168,741,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
/ us-gaap_FairValueByMeasurementFrequencyAxis
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102,327,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 2,498,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
/ us-gaap_FairValueByMeasurementFrequencyAxis
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1,994,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | US Agency Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 15,287,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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7,020,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 3,697,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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2,497,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 147,259,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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90,816,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 16,618,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
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80,968,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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2,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 16,618,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
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80,968,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Marketable securities 2,498,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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1,994,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 2,498,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Agency Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 0us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 0us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 0us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 16,618,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
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80,968,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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2,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Marketable securities 166,243,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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100,333,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 0us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Agency Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 15,287,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 3,697,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 147,259,000us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
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Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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