Without a doubt, the 179 SEC page filing is a must-read for ecommerce investors and entrepreneurs everywhere. The reason: on one extreme it highlights how well they have executed on an incredibly tough business in just four short years, going from a zero to $600 million in annual sales (my estimates for 2013). On the other extreme, they have limited profits and have lost $56 million to get to this point in their life-cycle. In between, there is a ton of interesting and pertinent information.
At a minimum, this blog post is must-read.