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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 56,044 $ 323
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 235 244
Stock-based compensation 278 885
Gain on sale of patent assets (71,226)  
Excess tax benefits from stock-based compensation 12,684  
Amortization of discount on investments (24)  
Gain on sale of investments (85)  
Provision for doubtful accounts 4  
Changes in assets and liabilities:    
Accounts receivable (775) (105)
Inventories 282 450
Prepaid expenses and other current assets (25) (5)
Accounts payable 144 86
Accrued expenses, compensation, and professional 291 (443)
Accrued income taxes 4,083  
Deferred revenue 294 406
Net cash provided by operating activities 2,204 1,841
Cash flows from investing activities:    
Purchases of property and equipment (59) (88)
Sales of investments 855  
Proceeds from sale of patent assets, net 71,226  
Net cash provided by (used in) investing activities 72,022 (88)
Cash flows from financing activities:    
Proceeds from issuance of common stock 5,798 1,684
Payment of dividends (25,506)  
Shares surrendered by employees to pay taxes related to unrestricted stock (37) (154)
Net cash provided by (used in) financing activities (19,745) 1,530
Increase in cash and cash equivalents 54,481 3,283
Cash and cash equivalents, beginning of period 46,577 39,949
Cash and cash equivalents, end of period $ 101,058 $ 43,232