I think it's a great company but their risk factors section in their filing is fairly alarming:

- We have a history of losses and we expect our revenue growth rate to decline. As our costs increase, we may not be able to generate sufficient revenue to achieve and sustain profitability.

- These investments may not result in increased revenue or growth of our business. We also expect that our revenue growth rate will decline over time. Accordingly, we may not be able to generate sufficient revenue to offset our expected cost increases and to achieve and sustain profitability. If we fail to achieve and sustain profitability, our operating results and business would be harmed.