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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 1,011 $ 66,341
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 325 343
Stock-based compensation 445 299
Gain on sale of patent assets   (86,394)
Amortization of premium (discount) on investments 13 (24)
Gain on sale of investments (27) (85)
Loss on disposal of property and equipment 27  
Provision for doubtful accounts   4
Changes in assets and liabilities:    
Accounts receivable 703 (277)
Receivable from patent arrangement 1,121  
Inventories   538
Prepaid expenses and other current assets (565) (210)
Deferred tax assets 185  
Accounts payable (85) (1)
Accrued expenses, compensation, and professional (261) (90)
Accrued income taxes   5,339
Due to customers 3,732  
Deferred revenue (954) 112
Net cash provided by (used in) operating activities 5,670 (14,105)
Cash flows from investing activities:    
Purchases of property and equipment (117) (90)
Proceeds from sale of property and equipment 24  
Purchases of investments (2,008) (1,017)
Sales of investments 1,064 855
Purchase of intangible assets (201)  
Proceeds from sale of patent assets, net   86,394
Net cash provided by (used in) investing activities (1,238) 86,142
Cash flows from financing activities:    
Proceeds from issuance of common stock 46 5,896
Payment of dividends   (25,506)
Excess tax benefits from stock-based compensation (63) 15,761
Payments made for taxes of employees who surrendered shares related to unrestricted stock (71) (174)
Net cash used in financing activities (88) (4,023)
Increase in cash and cash equivalents 4,344 68,014
Cash and cash equivalents, beginning of period 71,074 46,577
Cash and cash equivalents, end of period 75,418 114,591
Supplemental disclosure:    
Cash paid for income taxes $ 535 $ 2,388