CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 328,745	$ 306,386
Restricted cash	508	1,575
Marketable securities, short-term	37,975	28,485
Accounts receivable, net of allowance for doubtful accounts and returns of $1,247 and $2,484, respectively	108,672	98,992
Inventories	15,442	15,122
Prepaid expenses and other current assets	35,989	35,233
Total current assets	527,331	485,793
Marketable securities, long-term	10,680	21,252
Property, plant and equipment, net	72,672	79,191
Goodwill	58,543	99,236
Intangible assets, net	25,429	45,777
Deferred tax assets	28,417	21,609
Other assets	3,173	3,454
Total assets	726,245	756,312
Current liabilities:
Accounts payable	19,748	19,549
Accrued liabilities	64,635	74,247
Deferred revenues	59,472	61,975
Total current liabilities	143,855	155,771
Other long-term liabilities	21,272	19,224
Total liabilities	165,127	174,995
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.0001 par value (5,000 shares authorized; none issued)	0	0
Common stock, $0.0001 par value (200,000 shares authorized; 81,725 and 80,611 issued and outstanding in 2013 and 2012, respectively)	8	8
Additional paid-in capital	694,334	670,732
Accumulated other comprehensive income (loss), net	151	203
Accumulated deficit	(133,375)	(89,626)
Total stockholders' equity	561,118	581,317
Total liabilities and stockholders' equity	$ 726,245	$ 756,312