The disclosure is based upon a customers revenue earned breaking 10% of total quarter or total annual revenue to date.
That audit revenue in your example may have related to RIM or HTC (both per unit) and hence (by default if you will) they were disclosed in the note quoted below. Although neither name was specifically tied to the "audit" mention.
Also technically, $7.2 million (the difference between the $7.9M and prior periods $0.7M) is less than 10% of the $76.5M reported in that quarter. If the entire revenue of $7.2M was from one customer and they had no further revenue in the quarter which would have caused them to exceed the $7.65M threshold ($76.5M x 10%) then according to managements disclosure policy this customer would not be disclosed in the note below.
Customers that accounted for ten percent or more of the $76.5 million of third quarter 2011 total revenue were Samsung Electronics Company, Ltd. ("Samsung") (34 percent), Research in Motion Limited ("RIM") (13 percent) and HTC Corporation ("HTC") (12 percent).
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