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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income (loss) $ 11,256 $ (23,062) $ (19,104)
Adjustments to reconcile net income (loss) to net cash used in operating activities:      
Depreciation and amortization 1,110 1,000 857
Amortization of intangible assets 2,618 2,818 1,464
Stock-based compensation 3,766 3,298 3,054
Gain on sale of patents (35,611)    
Non-cash restructuring charges     122
Provision for doubtful accounts (125)   47
Other non-cash items 19 65 (33)
Changes in assets and liabilities, net of effects of acquisitions:      
Accounts receivable 235 (326) 742
Unbilled contracts receivable 128 1,055 1,921
Prepaid expenses and other assets 2,247 1,204 (307)
Deferred revenue (881) (1,027) (39)
Accounts payable (763) (125) 34
Accrued expenses and other liabilities 324 (365) 381
Accrued restructuring liabilities (19) (93) (878)
Net cash used in operating activities (15,696) (15,558) (11,739)
Cash flows from investing activities:      
Purchases of property and equipment (349) (1,412) (1,103)
Net cash paid for purchase of businesses (1,500) (7,935) (13,563)
Net proceeds from sale of patents 34,831    
Proceeds from sales and maturities of marketable securities 36,836 57,734 48,804
Purchases of marketable securities (31,587) (47,687) (31,893)
Net cash provided by investing activities 38,231 700 2,245
Cash flows from financing activities:      
Proceeds from issuance of common stock 3,336 2,191 40
Payments on capital lease obligations (186) (82)  
Proceeds from the sale of common stock, net of issuance costs   19,966  
Repurchase of common stock     (938)
Net cash provided by (used in) financing activities 3,150 22,075 (898)
Net increase (decrease) in cash and cash equivalents 25,685 7,217 (10,392)
Cash and cash equivalents at beginning of year 14,340 7,123 17,515
Cash and cash equivalents at end of year 40,025 14,340 7,123
Supplemental disclosure:      
Cash paid for income taxes 53 56 24
Patent license recorded in connection with patent sale 780    
Property and equipment acquired through capital lease   201 212
Transaction fees paid for repurchase of common stock     13
Intangible assets acquired for contingent consideration, in connection with acquisitions   $ 1,500 $ 4,550