Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 144,823	$ 139,049
Marketable securities	132,901	157,642
Accounts receivable, net	27,726	12,662
Inventories	20,507	18,092
Deferred tax assets	727	1,162
Refundable income taxes	3	910
Prepaid expenses and other current assets	7,226	7,458
Total current assets	333,913	336,975
Restricted cash	317	317
Property, plant and equipment, net	34,225	35,132
Deferred tax assets	5,818	5,954
Other assets	4,081	4,693
Total assets	378,354	383,071
Current liabilities:
Accounts payable	17,833	9,731
Accrued liabilities	16,107	13,966
Income taxes payable	278	100
Deferred revenue	6,232	4,798
Total current liabilities	40,450	28,595
Long-term income taxes payable	1,337	4,112
Deferred rent and other liabilities	4,158	3,712
Total liabilities	45,945	36,419
Commitments and contingencies (Note 16)
Stockholders' equity:
Preferred stock, $0.001 par value: 10,000,000 shares authorized; no shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively	0	0
Common stock, $0.001 par value: 250,000,000 shares authorized; 49,987,469 and 49,268,479 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively	51	50
Additional paid-in capital	659,830	652,024
Accumulated other comprehensive income	2,321	2,700
Accumulated deficit	(329,793)	(308,122)
Total stockholders' equity	332,409	346,652
Total liabilities and stockholders' equity	$ 378,354	$ 383,071