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Net Income Per Share Available Loss Attributable To Common Stockholders - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net loss attributable to common stockholders $ (8,967) $ (12,304) $ (32,678) $ (19,852)
Weighted-average shares outstanding - basic 62,753 59,913 62,009 44,538
Effect of dilutive potential common shares from stock options, restricted stock units and employee stock purchase plan 0 0 0 0
Weighted-average shares outstanding - diluted 62,753 59,913 62,009 44,538
Basic and diluted (in dollars per share) $ (0.14) $ (0.21) $ (0.53) $ (0.45)