Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation Plans and Awards (Schedule of Stock Option Activity) (Details)

v2.4.0.8
Stock-based Compensation Plans and Awards (Schedule of Stock Option Activity) (Details) (USD $)
 9 Months Ended
Sep. 30, 2014
Stock Awards  
Balance as of December 31, 2013 7,555,327
Options granted 3,461,391
Options exercised (228,306)
Options forfeited (749,901)
Options cancelled (127,542)
Balance as of September 30, 2014 9,910,969
Vested and expected to vest at September 30, 2014 9,276,442
Exercisable as of September 30, 2014 4,710,443
Weighted-Average Exercise Price  
Balance as of December 31, 2013 $ 0.45
Options granted $ 1.35
Options exercised $ 0.31
Options forfeited $ 1.13
Options cancelled $ 0.47
Balance as of September 30, 2014 $ 0.72
Vested and expected to vest at September 30, 2014 $ 0.69
Exercisable as of September 30, 2014 $ 0.41
Weighted-Average Remaining Contractual Life (Years)  
Balance as of September 30, 2014 7 years 5 months 12 days
Vested and expected to vest at September 30, 2014 7 years 4 months 2 days
Exercisable as of September 30, 2014 5 years 10 months 13 days
Aggregate Intrinsic Value  
Balance as of September 30, 2014 $ 2,704,099
Vested and expected to vest at September 30, 2014 2,645,583
Exercisable as of September 30, 2014 $ 2,093,011