Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Operating Activities:
Net income (loss)	$ 2,706	$ (6,171)
Adjustments to reconcile net income (loss) to net cash provided by operating activities from continuing operations:
(Income) loss from discontinued operations	(1,605)	9,031
Loss on sale of discontinued operations	1,054
Depreciation and amortization	749	797
Amortization of premium on held-to-maturity securities	20	27
Stock-based compensation	893	840
Deferred tax	(57)	(2,529)
Reduction of tax benefit from stock-based compensation plans	16	2
Other	(4)	11
Change in operating assets and liabilities:
Accounts receivable	(383)	428
Inventories	209	(43)
Accounts payable and accrued liabilities	(2,872)	695
Income taxes	1,263	3,051
Deferred revenue	(14)	518
Prepaids and other	(34)	65
Net cash provided by operating activities from continuing operations	1,941	6,722
Investing Activities:
Purchases of property and equipment	(157)	(832)
Purchases of available-for-sale securities	(2,724)	(1,412)
Sales and maturities of available-for-sale securities	2,641	1,200
Payment related to a prior business acquisition		(750)
Cash received from (transferred to) discontinued operations	24,684	(2,020)
Net cash provided by (used in) investing activities from continuing operations	24,444	(3,814)
Financing Activities:
Reduction of tax benefit from stock-based compensation plans	(16)	(2)
Issuance of common stock	79
Purchase of common stock to pay employee taxes	(170)
Net cash used in financing activities from continuing operations	(107)	(2)
Net cash provided by continuing operations	26,278	2,906
Discontinued Operations:
Net cash used in operating activities	(2,344)	(1,447)
Net cash provided by (used in) investing activities	26,892	(561)
Net cash (used in) provided by financing activities	(24,684)	2,020
Net cash (used in) provided by discontinued operations	(136)	12
Net change in cash and cash equivalents	26,142	2,918
Cash and Cash Equivalents:
Beginning of period	23,217	11,391
End of period	49,359	14,309
Supplemental Information:
Cash paid (received) for income taxes	23	(36)
Noncash transaction - acquisition of property and equipment on account	8	348
Noncash transaction - milestone payment obligation		$ 4,900