Condensed Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 76,770		$ 103,802
Short-term investments	303,736		338,801
Accounts receivable, net of allowance for doubtful accounts of $43 at December 31, 2012	2,237		11,595
Inventories	0		1,507
Short-term deferred tax assets	4,272		3,880
Current assets of discontinued operations	16,570	[1]	0
Other current assets	14,343		15,701
Total current assets	417,928		475,286
Property and equipment, net	55,912		72,544
Intangible assets, net	97,597		120,432
Long-term deferred tax assets	57,738		22,499
Long-term assets of discontinued operations	730		0
Other assets	860		7,677
Goodwill	0		6,664
Total assets	630,765		705,102
Current liabilities:
Accounts payable	6,135		14,437
Accrued legal fees	11,534		11,726
Accrued liabilities	14,581		22,140
Deferred revenue	4,597		4,869
Current liabilities of discontinued operations	4,874		0
Total current liabilities	41,721		53,172
Long-term deferred tax liabilities	0		3,102
Other long-term liabilities	5,752		6,403
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock: $0.001 par value; 10,000 shares authorized and no shares issued and outstanding	0		0
Common stock: $0.001 par value; 150,000 shares authorized; 54,491 and 52,947 shares issued, respectively, and 53,826 and 52,293 shares outstanding, respectively	54		53
Additional paid-in capital	508,751		480,347
Treasury stock at cost; 665 and 654 shares of common stock at each period end, respectively	(10,854)		(10,642)
Accumulated other comprehensive income (loss)	(107)		119
Retained earnings	85,448		172,548
Total stockholders’ equity	583,292		642,425
Total liabilities and stockholders’ equity	$ 630,765		$ 705,102

[1] All current assets of discontinued operations are assets held for sale.