Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 100,155 $ 73,638
Short-term investments 190,567 126,092
Restricted cash 364 0
Accounts receivable 38,477 25,144
Other receivables 0 33,775
Prepaid expenses and other current assets 10,546 5,237
Deferred tax assets 3,817 7,658
Total current assets 343,926 271,544
Patent assets, net 219,954 199,314
Property and equipment, net 4,667 3,144
Intangible assets, net 1,718 3,226
Goodwill 16,460 16,460
Restricted cash, less current portion 1,454 0
Other assets 622 279
Total assets 588,801 493,967
Current liabilities:    
Accounts payable 332 568
Accrued liabilities 8,784 7,206
Deferred revenue 131,808 101,249
Deferred payment obligations 500 500
Other current liabilities 1,638 1,813
Total current liabilities 143,062 111,336
Deferred revenue, less current portion 5,935 3,122
Deferred tax liabilities, less current portion 11,654 18,108
Other liabilities 3,227 1,142
Total liabilities 163,878 133,708
Common stock 5 5
Additional paid-in capital 305,343 281,530
Retained earnings 119,527 78,744
Accumulated other comprehensive income (loss) 48 (20)
Total stockholders' equity 424,923 360,259
Total liabilities and stockholders' equity $ 588,801 $ 493,967