A big chunk of the stock-based compensation they are expensing is related to pre IPO equity grants. E.g. if they granted some stock to an engineer in 2009, they now have to recognize that as an expense in 2013 because of the IPO. In my example, the dilution happened in 2009 but affects GAAP profitability in 2013. I understand why ongoing stock-based compensation should be included in the income statement, but I'm less clear about why stock grants that happened way in the past are important.
I posted this in another thread, but they acknowledged this situation in their S-1 (from last September).
Following the completion of this offering, the stock-based compensation expense related to Pre-2013 RSUs and other outstanding equity awards will have a significant negative impact on our ability to achieve profitability on a GAAP basis in 2013 and 2014.
http://www.sec.gov/Archives/edgar/data/1418091/0001193125134...