I don't think it was widely reported, but it was kind of a dealbreaker because it meant that existing x86 code simply wouldn't run and therefore it was impossible to use standard Linux distros or toolchains on the Quark. Between that, the difficulty of getting chips, the rather poor performance and power usage, and the complexity of integrating it, I think it was basically dead on arrival. The main thing Intel seemed to get out of it was a bunch of very favourable articles about how they'd be part of the Internet of Things revolution. The whole thing seemed ill-conceived; it was a 486 going up against modern RISC designs with predictable results.