Many left, others were laid off. Some remain. But they had some world class engineering talent (like in their optics - real domain experts they brought from other places and industries). The goals were unrealistic, the product was out of touch with the market (lots of money raised is going to do that 9/10 times), the top management were professional corporate creatures (not in a good sense). But some of the engineers were very good - just sent on the wrong mission.