Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 68,059	$ 106,749
Short-term investments	151,817	126,976
Restricted cash		500
Accounts receivable	13,543	16,160
Prepaid expenses and other current assets	8,522	12,124
Deferred tax assets	4,604	5,192
Total current assets	246,545	267,701
Patent assets, net	192,445	163,352
Property and equipment, net	3,437	2,317
Intangible assets, net	4,091	1,837
Goodwill	16,460	1,675
Restricted cash, less current portion		147
Deferred tax assets, less current portion	8,672	300
Other assets	3,002	665
Total assets	474,652	437,994
Current liabilities:
Accounts payable	595	821
Accrued liabilities	4,624	7,762
Deferred revenue	98,259	96,513
Deferred payment obligations	1,099	5,056
Other current liabilities	6,033	2,182
Total current liabilities	110,610	112,334
Deferred revenue, less current portion	7,721	11,762
Deferred tax liabilities	22,837	14,695
Other liabilities	38	119
Total liabilities	141,206	138,910
Common stock	5	5
Additional paid-in capital	272,413	259,315
Retained earnings	61,056	39,787
Accumulated other comprehensive loss	(28)	(23)
Total stockholders' equity	333,446	299,084
Total liabilities and stockholders' equity	$ 474,652	$ 437,994