CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 164,497	$ 306,386
Restricted cash	516	1,575
Marketable securities, short-term	113,933	28,485
Accounts receivable, net of allowances for doubtful accounts and returns of $1,101 and $2,484, respectively	112,367	98,992
Inventories	15,704	15,122
Prepaid expenses and other current assets	35,076	35,233
Total current assets	442,093	485,793
Marketable securities, long-term	62,885	21,252
Property, plant and equipment, net	76,932	79,191
Goodwill	61,713	99,236
Intangible assets, net	24,975	45,777
Deferred tax assets	30,622	21,609
Other assets	4,674	3,454
Total assets	703,894	756,312
Current liabilities:
Accounts payable	21,556	19,549
Accrued liabilities	75,776	74,247
Deferred revenues	63,322	61,975
Total current liabilities	160,654	155,771
Other long-term liabilities	23,042	19,224
Total liabilities	183,696	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; 79,699 and 80,611 issued and outstanding at 2013 and 2012, respectively)	8	8
Additional paid-in capital	693,102	670,732
Accumulated other comprehensive income (loss), net	(44)	203
Accumulated deficit	(172,868)	(89,626)
Total stockholders' equity	520,198	581,317
Total liabilities and stockholders' equity	$ 703,894	$ 756,312