Related Party Transactions (Narrative) (Details) (Jimmy S.M. Lee, Executive Chairman, USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Related Party Transaction [Line Items]
Revenue from related parties		$ 82	$ 172	$ 190	$ 286
Accounts receivable, related parties		44		44		30
Giantec Semiconductor, Inc
Related Party Transaction [Line Items]
Revenue from related parties		18	18	36	36
Accounts receivable, related parties		6		6		12
Ownership percentage	19.85%
Purchases with related party		78		152
Accounts payable		78		78		26
Licensing fees received from Giantec		$ 0	$ 12	$ 5	$ 22