Answer, you can try to sue, but there's probably very little chance you'll get your money any time soon. Whether you want to pursue this or not depends on a few things. Do you feel they mislead you? Do you think they really have money and are just lying to you?
The flipside of my experiences was about 4 years after that scenario above, I did some contracting with a company - remotely (unfortunately) and they didn't pay. I found out from discussions that the PM on my project quit soon after I started, another developer on the project quit as well. He'd told me he'd quit because he was tired of the contractors bitching to him they weren't getting paid - apparently this was a habit company X had. I had other contractors seek me out and tell me they'd been shafted on payments too - one for $700, and another for $3500. Mine was to the tune of close to $9000. (never again!). So... I drove up to his state and filed a lawsuit. It's been > 2 years, and it's still in the system. Will probably take another year, and at that point, I'd still have to collect. At this point, it's a matter of principal - the company's whole MO was to farm out work to contractors in various states, then not send payment. That's a whole other level of evil, imo.
But maybe I'm biased and I really was as scammy as the guy who didn't pay me? I don't think so. I was honest with people - there's no money coming in - take another job if you can get one. That's not what happened to me a few years later, though perhaps some might see it as divine retribution?