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CONDENSED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 7,600 $ 12,990
Restricted cash 265 795
Current portion of marketable securities 118,801 52,234
Interest and other receivables 787 564
Prepaid assets 739 474
Total current assets 128,192 67,057
Noncurrent portion of marketable securities 15,801  
Property and equipment, net 63 92
Deposits and other assets 191 195
Total assets 144,247 67,344
Current liabilities:    
Accounts payable 2,365 1,397
Accrued compensation and benefits 2,685 3,946
Accrued restructuring charges   94
Accrued liabilities 2,018 1,783
Fair value of derivatives 1 367
Total current liabilities 7,069 7,587
Commitments and contingencies      
Stockholders' equity:    
Common stock 157 131
Additional paid-in capital 1,056,543 952,403
Accumulated deficit (919,486) (892,763)
Accumulated other comprehensive loss (36) (14)
Total stockholders' equity 137,178 59,757
Total liabilities and stockholders' equity $ 144,247 $ 67,344