Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Common Share - Calculation of Basic and Diluted Net Loss Per Share (Detail)

v2.4.1.9
Net Loss Per Common Share - Calculation of Basic and Diluted Net Loss Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator    
Net loss $ (12,056)us-gaap_NetIncomeLoss $ (7,370)us-gaap_NetIncomeLoss
Denominator    
Weighted-average common stock outstanding—for basic and diluted net loss per share 38,574,702us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 35,900,596us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted net loss per share attributed to the Common Stockholders $ (0.31)us-gaap_EarningsPerShareBasicAndDiluted $ (0.21)us-gaap_EarningsPerShareBasicAndDiluted