Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 81,644	$ 96,371
Short-term investments	103,013	77,827
Accounts receivable, net of allowances of $5 in 2012 and 2011	21,415	15,097
Inventories	29,455	20,104
Deferred income tax assets, net - current	646	421
Prepaid expenses and other current assets	1,978	1,685
Total current assets	238,151	211,505
Property and equipment, net	59,584	47,794
Long-term investments	11,714	13,675
Deferred income tax assets, net - long-term	19	239
Other assets	606	654
Total assets	310,074	273,867
Current liabilities:
Accounts payable	17,701	8,904
Accrued compensation and related benefits	11,035	9,321
Accrued liabilities	6,848	7,845
Total current liabilities	35,584	26,070
Non-current income tax liabilities	5,249	4,920
Total liabilities	40,833	30,990
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value, $35 and $34 in 2012 and 2011, respectively; shares authorized: 150,000,000; shares issued and outstanding: 34,820,281 and 33,826,032 in 2012 and 2011, respectively	175,624	159,336
Retained earnings	89,535	79,948
Accumulated other comprehensive income	4,082	3,593
Total stockholders’ equity	269,241	242,877
Total liabilities and stockholders’ equity	$ 310,074	$ 273,867