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CONDENSED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 9,520 $ 12,990
Restricted cash 795 795
Current portion of marketable securities 130,816 52,234
Interest and other receivables 1,256 564
Prepaid assets 205 474
Total current assets 142,592 67,057
Noncurrent portion of marketable securities 6,496  
Property and equipment, net 60 92
Deposits and other assets 191 195
Total assets 149,339 67,344
Current liabilities:    
Accounts payable 1,223 1,397
Accrued compensation and benefits 2,186 3,946
Accrued restructuring charges   94
Accrued liabilities 1,057 1,783
Fair value of derivatives 290 367
Total current liabilities 4,756 7,587
Commitments and contingencies      
Stockholders' equity:    
Common stock 157 131
Additional paid-in capital 1,054,383 952,403
Accumulated deficit (909,937) (892,763)
Accumulated other comprehensive loss (20) (14)
Total stockholders' equity 144,583 59,757
Total liabilities and stockholders' equity $ 149,339 $ 67,344