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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 12,990 $ 22,063
Restricted cash 795 794
Marketable securities 52,234 73,472
Interest and other receivables 564 752
Prepaid assets 474 1,336
Total current assets 67,057 98,417
Property and equipment, net 92 974
Deposits and other assets 195 410
Total assets 67,344 99,801
Current liabilities:    
Accounts payable 1,397 3,429
Accrued compensation and benefits 3,946 5,216
Accrued restructuring charges 94 1,972
Accrued liabilities 1,783 3,480
Fair value of derivatives 367 51
Total current liabilities 7,587 14,148
Commitments and contingencies      
Stockholders' equity:    
Preferred stock, $0.001 par value; 3,000,000 shares authorized; no shares issued and outstanding at December 31, 2013 and 2012      
Common stock, $0.001 par value; 300,000,000 shares authorized; 130,677,949 and 130,242,695 shares issued and outstanding at December 31, 2013 and 2012, respectively 131 130
Additional paid-in capital 952,403 939,867
Accumulated deficit (892,763) (854,384)
Accumulated other comprehensive (loss) income (14) 40
Total stockholders' equity 59,757 85,653
Total liabilities and stockholders' equity $ 67,344 $ 99,801