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Condensed Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows provided by (used in) operating activities:    
Net income (loss) $ 30 $ (207)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Deferred program fee revenue (2,724) (2,724)
Non-cash stock based compensation 907 1,303
Depreciation and amortization 35 53
Non-cash net interest income 133 386
Changes in operating assets and liabilities:    
Other current assets (117) 5,178
Other non-current assets   (11)
Accounts payable 38 (671)
Accrued development expense (495) 177
Accrued compensation and benefits 171 (212)
Other accrued liabilities (48) (3)
Net cash provided by (used in) operating activities (2,070) 3,269
Cash flows provided by investing activities:    
Purchases of marketable securities (4,795)  
Maturities of marketable securities 7,500 42,402
Net cash provided by investing activities 2,705 42,402
Cash flows provided by financing activities:    
Proceeds from issuance of common stock, net   4,425
Net cash provided by financing activities   4,425
Net increase in cash and cash equivalents 635 50,096
Cash and cash equivalents at beginning of the period 73,144 [1] 4,798
Cash and cash equivalents at end of the period $ 73,779 $ 54,894
[1] Derived from the Company's audited financial statements as of December 31, 2011, included in the Company's Annual Report on Form 10-K filed with the Securities and Exchange Commission.