Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities
Net income (loss)	$ (1,205)	$ 1,809
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	138	179
Employee and non-employee stock-based compensation	2,929	2,760
Loss on disposal of assets		(23)
Amortization of premiums and discounts on marketable securities	574	(34)
Amortization of intangible asset	741	741
Deferred tax benefit		(1,794)
Changes in assets and liabilities:
Accounts receivable	(241)	2,509
Inventory		2,399
Prepaid expenses, deposits and other current assets	(349)	573
Accounts payable	689	(1,404)
Accrued liabilities	1,189	(913)
Accrued income taxes	(45)	5,763
Other liabilities	(19)	(9)
Deferred revenue	(13,284)	(13,284)
Net cash used in operating activities	(8,883)	(728)
Cash flows from investing activities
Purchases of property and equipment	(164)
Proceeds from sale of property and equipment		66
Purchases of marketable securities	(89,576)	(63,877)
Maturities of marketable securities	106,550	2,500
Change in restricted cash	(100)
Net cash provided by (used in) investing activities	16,710	(61,311)
Cash flows from financing activities
Excess tax benefits from stock-based compensation		1,658
Proceeds from exercise of stock options		737
Net cash provided by financing activities		2,395
Net change in cash and cash equivalents	7,827	(59,644)
Cash and cash equivalents
Beginning of period	42,559	205,295
End of period	$ 50,386	$ 145,651