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Condensed Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows provided by (used in) operating activities:    
Net loss $ (101) $ (1,407)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Deferred program fee revenue (5,448) (5,448)
Non-cash stock based compensation 1,776 2,726
Depreciation and amortization 70 93
Non-cash net interest income 270 686
Changes in operating assets and liabilities:    
Receivables   6,275
Other current assets 263 60
Other non-current assets 1 (11)
Accounts payable 37 (503)
Accrued development expense (309) 318
Accrued compensation and benefits (538) (1,080)
Other accrued liabilities (41) 13
Net cash provided by (used in) operating activities (4,020) 1,722
Cash flows provided by investing activities:    
Purchases of marketable securities (9,590)  
Maturities of marketable securities 19,300 47,400
Net cash provided by investing activities 9,710 47,400
Cash flows provided by financing activities:    
Proceeds from issuance of common stock, net 186 8,910
Net cash provided by financing activities 186 8,910
Net increase in cash and cash equivalents 5,876 58,032
Cash and cash equivalents at beginning of the period 73,144 [1] 4,798
Cash and cash equivalents at end of the period $ 79,020 $ 62,830
[1] (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.