It's pretty much always a bad idea to invest in a stock on the day of an IPO. Useful information is scarce, so it's a bit like investing in the dark.
What's the market cap? You might have to do your own math. Also, you want to avoid hitting the "market price" button when buying shares from your broker. You think your broker is a nice guy and then you hit "market price" on IPO day and start making statements like, "I paid what?"
So I never buy on the first day. I wait for the excitement to cool down. In a lot of cases, the stock will probably get cheaper and a better deal will become available.
Source Fool.com