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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 9,591 | $ 22,063
Restricted cash | 795 | 794
Marketable securities | 56,617 | 73,472
Interest and other receivables | 555 | 752
Prepaid assets | 844 | 1,336
Total current assets | 68,402 | 98,417
Property and equipment, net | 116 | 974
Deposits and other assets | 195 | 410
Total assets | 68,713 | 99,801
Current liabilities: |  |
Accounts payable | 1,547 | 3,429
Accrued compensation and benefits | 2,886 | 5,216
Accrued restructuring charges | 161 | 1,972
Accrued liabilities | 1,985 | 3,480
Fair value of derivatives | 258 | 51
Total current liabilities | 6,837 | 14,148
Commitments and contingencies |  |
Stockholders' equity: |  |
Common stock | 129 | 130
Additional paid-in capital | 945,241 | 939,867
Accumulated deficit | (883,482) | (854,384)
Accumulated other comprehensive (loss) income | (12) | 40
Total stockholders' equity | 61,876 | 85,653
Total liabilities and stockholders' equity | $ 68,713 | $ 99,801

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