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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net loss $ (13,768) $ (11,681)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 498 562
Stock-based compensation 2,063 1,553
Amortization of intangible assets 1,246 1,309
Gain on sale of assets (1,856)  
Provision for doubtful accounts   106
Other non-cash items   18
Changes in assets and liabilities:    
Accounts receivable 643 427
Prepaid expenses and other assets 308 853
Deferred revenue (69) (75)
Accounts payable (190) (609)
Accrued expenses and other liabilities (87) 251
Net cash used in operating activities (11,212) (7,286)
Cash flows from investing activities:    
Purchases of property and equipment (40) (316)
Net proceeds from sale of assets 2,187  
Net cash paid for purchase of MagnaLynx, Inc.   (1,000)
Proceeds from sales and maturities of marketable securities 19,396 16,873
Purchases of marketable securities (46,417) (20,563)
Net cash used in investing activities (24,874) (5,006)
Cash flows from financing activities:    
Proceeds from issuance of common stock 1,569 2,465
Repurchase of common stock (Note 4) (1,444)  
Payments on capital lease obligations (94) (93)
Net cash provided by financing activities 31 2,372
Net decrease in cash and cash equivalents (36,055) (9,920)
Cash and cash equivalents at beginning of period 40,025 14,340
Cash and cash equivalents at end of period $ 3,970 $ 4,420