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Net loss per share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator    
Net loss $ (37,915)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (14,098)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator    
Denominator for basic and diluted net loss per share (in shares) 33,067,752us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 24,492,487us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share:    
Basic and diluted (in dollars per share) $ (1.15)us-gaap_EarningsPerShareBasicAndDiluted $ (0.58)us-gaap_EarningsPerShareBasicAndDiluted