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Condensed Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows used in operating activities:    
Net income (loss) $ (408) $ 30
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Deferred program fee revenue (1,958) (2,724)
Non-cash stock based compensation 679 907
Depreciation and amortization   35
Non-cash net interest income (7) 133
Changes in operating assets and liabilities:    
Other current assets 126 (117)
Accounts payable 5 38
Accrued development expense (547) (495)
Accrued compensation and benefits 261 171
Other accrued liabilities (24) (48)
Net cash used in operating activities (1,873) (2,070)
Cash flows provided by investing activities:    
Purchases of marketable securities (2,797) (4,795)
Maturities of marketable securities 6,900 7,500
Net cash provided by investing activities 4,103 2,705
Cash flows provided by financing activities:    
Proceeds from issuance of common stock, net 6  
Net cash provided by financing activities 6  
Net increase in cash and cash equivalents 2,236 635
Cash and cash equivalents at beginning of the period 49,355 [1] 73,144
Cash and cash equivalents at end of the period $ 51,591 $ 73,779
[1] Derived from the Company's audited financial statements as of December 31, 2012, included in the Company's Annual Report on Form 10-K filed with the Securities and Exchange Commission.