However, they could not get the technology to work and abandoned several development paths in favour of a less ambitious approach that, among other things, involved doing blood analysis the old-fashioned way (manually in the lab), and only pretending to be using new tech they'd invented. They knew it didn't work, but kept selling it anyway, which is where it went from just faking it to outright fraud.
Most of their money was raised after they failed to develop their blood analysis technology, but to the investors, to the press and to their clients (such as Walgreens), they were still claiming to be using their proprietary technology [1].
[1] http://m.nautil.us/issue/60/searches/does-theranos-mark-the-...