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Condensed Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets    
Cash and cash equivalents $ 51,591 $ 49,355 [1]
Marketable securities 2,800 6,899 [1]
Other current assets 127 253 [1]
Total current assets 54,518 56,507 [1]
Other assets 352 352 [1]
Total assets 54,870 56,859 [1]
Current liabilities    
Accounts payable 366 361 [1]
Accrued development expense 382 929 [1]
Deferred program fee revenue - current portion 7,832 7,832 [1]
Accrued compensation and benefits 1,114 853 [1]
Other current liabilities   24 [1]
Total current liabilities 9,694 9,999 [1]
Non-current liabilities    
Deferred program fee revenue - non-current portion 31,329 33,287 [1]
Deferred tax liabilities 437 437 [1]
Total liabilities 41,460 43,723 [1]
Commitments and contingencies       [1]
Stockholders' equity    
Preferred stock       [1]
Common stock 45 45 [1]
Additional paid-in-capital 149,423 148,738 [1]
Accumulated other comprehensive income 1 4 [1]
Accumulated deficit (136,059) (135,651) [1]
Total stockholders' equity 13,410 13,136 [1]
Total liabilities and stockholders' equity $ 54,870 $ 56,859 [1]
[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.