Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 78,247	$ 96,371
Short-term investments	107,279	77,827
Accounts receivable, net of allowances of $5 in 2012 and 2011	21,561	15,097
Inventories	32,623	20,104
Deferred income tax assets, net - current	644	421
Prepaid expenses and other current assets	2,214	1,685
Total current assets	242,568	211,505
Property and equipment, net	59,883	47,794
Long-term investments	11,756	13,675
Deferred income tax assets, net - long-term	19	239
Other assets	1,043	654
Total assets	315,269	273,867
Current liabilities:
Accounts payable	11,405	8,904
Accrued compensation and related benefits	5,959	9,321
Accrued liabilities	7,500	7,845
Total current liabilities	24,864	26,070
Non-current income tax liabilities	5,341	4,920
Total liabilities	30,205	30,990
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock, $0.001 par value; shares authorized: 150,000,000; shares issued and outstanding: 35,431,808 and 33,826,032 in 2012 and 2011, respectively	185,583	159,336
Retained earnings	95,456	79,948
Accumulated other comprehensive income	4,025	3,593
Total stockholders’ equity	285,064	242,877
Total liabilities and stockholders’ equity	$ 315,269	$ 273,867