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Net Loss Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Basic and diluted net loss per share attributable to common stockholders      
Net loss $ (48,429)us-gaap_NetIncomeLoss $ (25,056)us-gaap_NetIncomeLoss $ (74,495)us-gaap_NetIncomeLoss
Weighted average common shares outstanding 70,837us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 58,540us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 55,828us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted (in dollars per share) $ (0.68)us-gaap_EarningsPerShareBasicAndDiluted $ (0.43)us-gaap_EarningsPerShareBasicAndDiluted $ (1.33)us-gaap_EarningsPerShareBasicAndDiluted