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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net loss $ (7,215) $ (6,029)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 258 281
Stock-based compensation 1,043 709
Amortization of intangible assets 683 655
Gain on sale of assets (1,856)  
Provision for doubtful accounts   106
Other non-cash items   16
Changes in assets and liabilities:    
Accounts receivable 661 (272)
Unbilled contracts receivable 68 18
Prepaid expenses and other assets 13 847
Deferred revenue (45) 385
Accounts payable (39) (634)
Accrued expenses and other liabilities 201 (5)
Net cash used in operating activities (6,228) (3,923)
Cash flows from investing activities:    
Purchases of property and equipment (25) (240)
Net proceeds from sale of assets 2,187  
Proceeds from sales and maturities of marketable securities 8,454 10,353
Purchase of marketable securities (35,793) (15,853)
Net cash used in investing activities (25,177) (5,740)
Cash flows from financing activities:    
Proceeds from issuance of common stock 847 1,269
Payments on capital lease obligations (47) (47)
Net cash provided by financing activities 800 1,222
Net decrease in cash and cash equivalents (30,605) (8,441)
Cash and cash equivalents at beginning of period 40,025 14,340
Cash and cash equivalents at end of period $ 9,420 $ 5,899