CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities:
Net income (loss)	$ 19,902	$ 4,945	$ (2,688)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	19,995	20,337	20,495
Deferred income taxes	373	662	(7,351)
Stock-based compensation expense	5,562	6,172	10,696
Impairment of investment in auction rate securities			431
Gain on sale of long-term investments		(454)
Loss on disposal of long-term assets	14	117	1,100
Allowance for doubtful accounts	417	355	(1,194)
Other changes in operating assets and liabilities:
Accounts receivable, net	(481)	(10,334)	(54,745)
Inventories	13,006	(19,178)	29,328
Prepaid expenses and other current assets	214	(924)	3,605
Other assets	667	1,248	(824)
Accounts payable	3,293	(26,980)	2,496
Accrued liabilities	9,043	1,512	(5,368)
Long-term liabilities	(2,053)	(38)	(988)
Income taxes payable	210	(75)	13
Net cash provided by (used in) operating activities	70,162	(22,635)	(4,994)
Investing activities:
Purchases of property and equipment	(11,732)	(9,547)	(6,345)
Capitalization of product costs	(8,122)	(7,617)	(7,977)
Purchases of intangible assets		(5,335)	(235)
Disposal of property and equipment	67
Sales of investments		1,263	1,282
Other	(65)
Net cash used in investing activities	(19,852)	(21,236)	(13,275)
Financing activities:
Proceeds from stock option exercises and employee stock purchase plans	3,029	1,883	77
Net cash paid for payroll taxes on restricted stock unit releases	(797)	(262)	(275)
Borrowing on line of credit	35,000	42,000
Paydown on line of credit	(35,000)	(42,000)
Net cash provided by (used in) financing activities	2,232	1,621	(198)
Effect of exchange rate changes on cash	(158)	117	978
Net change in cash and cash equivalents	52,384	(42,133)	(17,489)
Cash and cash equivalents, beginning of period	19,479	61,612	79,101
Cash and cash equivalents, end of period	71,863	19,479	61,612
Supplemental disclosures of cash flow information:
Cash paid for interest expense	(258)	(222)	(117)
Cash (paid) refunded for income taxes, net	(412)	281	(164)
Non-cash investing and financing activities:
Temporary gains on auction rate securities, net		$ 194	$ 435