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Net Loss Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basic and diluted net loss per share attributable to common stockholders    
Net loss $ (11,623)us-gaap_NetIncomeLoss $ (9,921)us-gaap_NetIncomeLoss
Weighted average common shares outstanding 80,461us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 60,102us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share - basic and diluted (in dollars per share) $ (0.14)us-gaap_EarningsPerShareBasicAndDiluted $ (0.17)us-gaap_EarningsPerShareBasicAndDiluted