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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income (loss) $ (27,614) $ 11,256 $ (23,062)
Adjustments to reconcile net income (loss) to net cash used in operating activities:      
Depreciation and amortization 952 1,110 1,000
Amortization of intangible assets 1,746 2,618 2,818
Stock-based compensation 3,811 3,766 3,298
Gain on sale of assets (3,291) (35,611)  
Provision for (recovery of) doubtful accounts   (125)  
Other non-cash items   19 65
Changes in assets and liabilities, net of effects of acquisition:      
Accounts receivable 682 235 (326)
Prepaid expenses and other assets 371 2,375 2,259
Deferred revenue (439) (881) (1,027)
Accounts payable (84) (763) (125)
Accrued expenses and other liabilities 1,850 305 (458)
Net cash used in operating activities (22,016) (15,696) (15,558)
Cash flows from investing activities:      
Purchases of property and equipment (738) (349) (1,412)
Net cash paid for purchase of businesses   (1,500) (7,935)
Net proceeds from sale of assets 3,437 34,831  
Proceeds from sales and maturities of marketable securities 34,371 36,836 57,734
Purchases of marketable securities (54,592) (31,587) (47,687)
Net cash (used in) provided by investing activities (17,522) 38,231 700
Cash flows from financing activities:      
Proceeds from issuance of common stock 3,636 3,336 2,191
Repurchase of common stock (1,444)    
Payments on capital lease obligations (150) (186) (82)
Proceeds from the sale of common stock, net of issuance costs     19,966
Net cash provided by financing activities 2,042 3,150 22,075
Net increase (decrease) in cash and cash equivalents (37,496) 25,685 7,217
Cash and cash equivalents at beginning of year 40,025 14,340 7,123
Cash and cash equivalents at end of year 2,529 40,025 14,340
Supplemental disclosure:      
Cash paid for income taxes 345 53 56
Patent license recorded in connection with patent sale   780  
Property and equipment acquired through capital lease     201
Intangible assets acquired for contingent consideration, in connection with acquisition     $ 1,500