Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 96,371	$ 48,010
Short-term investments	77,827	129,709
Accounts receivable, net of allowances of $5 in 2011 and $0 in 2010	15,097	18,347
Inventories	20,104	25,789
Deferred income tax assets, net - current	421	204
Prepaid expenses and other current assets	1,685	2,314
Total current assets	211,505	224,373
Property and equipment, net	47,794	37,262
Long-term investments	13,675	19,180
Deferred income tax assets, net - long-term	239	39
Other assets	654	749
Total assets	273,867	281,603
Current liabilities:
Accounts payable	8,904	8,979
Accrued compensation and related benefits	9,321	8,792
Accrued liabilities	7,845	11,199
Total current liabilities	26,070	28,970
Non-current income tax liabilities	4,920	5,015
Other long-term liabilities		723
Total liabilities	30,990	34,708
Stockholders' equity:
Common stock, $0.001 par value, $34 and $35 in 2011 and 2010, respectively; shares authorized: 150,000,000; shares issued and outstanding: 33,826,032 and 35,063,033 in 2011 and 2010, respectively	159,336	178,269
Retained earnings	79,948	66,647
Accumulated other comprehensive income	3,593	1,979
Total stockholders’ equity	242,877	246,895
Total liabilities and stockholders’ equity	$ 273,867	$ 281,603