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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net loss $ (19,841) $ (18,544)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 730 839
Stock-based compensation 2,991 2,474
Amortization of intangible assets 1,496 1,964
Gain on sale of assets (3,291)  
Provision for doubtful accounts   106
Other non-cash items (27) 18
Changes in assets and liabilities:    
Accounts receivable 968 371
Prepaid expenses and other assets 161 1,126
Deferred revenue (257) (589)
Accounts payable (211) (355)
Accrued expenses and other liabilities (203) (289)
Net cash used in operating activities (17,484) (12,879)
Cash flows from investing activities:    
Purchases of property and equipment (257) (349)
Net proceeds from sale of assets 3,437  
Net cash paid for purchase of MagnaLynx, Inc.   (1,000)
Proceeds from sales and maturities of marketable securities 29,175 30,314
Purchases of marketable securities (50,497) (27,712)
Net cash (used in) provided by investing activities (18,142) 1,253
Cash flows from financing activities:    
Proceeds from issuance of common stock 3,146 3,207
Repurchase of common stock (Note 4) (1,444)  
Payments on capital lease obligations (134) (140)
Net cash provided by financing activities 1,568 3,067
Net decrease in cash and cash equivalents (34,058) (8,559)
Cash and cash equivalents at beginning of period 40,025 14,340
Cash and cash equivalents at end of period $ 5,967 $ 5,781