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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
Operating Activities:    
Net loss $ (7,268) $ (9,578)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 168 162
Amortization of premium / discount on marketable securities 272 320
Stock-based compensation 1,383 1,963
Changes in operating assets and liabilities:    
Interest receivable (39) (55)
Accounts receivable (589) (1,104)
Prepaid expenses and other assets 60 48
Accounts payable and accrued liabilities (3,070) (3,146)
Accrued compensation and employee benefits (676) (491)
Deferred revenues 12,626 (77)
Net cash provided by / (used in) in operating activities 2,867 (11,958)
Investing Activities:    
Purchases of investments (12,853) (15,122)
Maturities of investments 17,820 22,438
Purchases of property and equipment (218) (110)
Net cash provided by investing activities 4,749 7,206
Financing Activities:    
Proceeds from issuance of common stock 108 847
Net cash provided by financing activities 108 847
Net increase / (decrease) in cash and cash equivalents 7,724 (3,905)
Cash and cash equivalents, beginning of period 16,766 10,784
Cash and cash equivalents, end of period $ 24,490 $ 6,879