Quarterly report pursuant to Section 13 or 15(d)

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

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Stock-based Compensation Plans and Awards (Summary of Stock Option Activity) (Details) - Jun. 30, 2015 - 2014 Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
Total
Stock Awards  
Balance as of December 31, 2014 10,791,081
Options granted 3,184,000
Options exercised (697,356)
Options forfeited (40,507)
Options cancelled (10,126)
Balance as of June 30, 2015 13,227,092
Vested and expected to vest at June 30, 2015 12,118,042
Exercisable as of June 30, 2015 5,970,959
Weighted-Average Exercise Price  
Balance as of December 31, 2014 $ 0.79
Options granted 1.40
Options exercised 0.55
Options forfeited 0.57
Options cancelled 1.74
Balance as of June 30, 2015 0.96
Vested and expected to vest at June 30, 2015 0.92
Exercisable as of June 30, 2015 $ 0.60
Weighted-Average Remaining Contractual Life (Years)  
Balance as of June 30, 2015 7 years 10 months 10 days
Vested and expected to vest at June 30, 2015 7 years 8 months 16 days
Exercisable as of June 30, 2015 6 years 2 months 23 days
Aggregate Intrinsic Value  
Balance as of June 30, 2015 $ 4,197
Vested and expected to vest at June 30, 2015 4,131
Exercisable as of June 30, 2015 $ 3,451