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BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 12,810 | $ 21,248
Restricted cash | 268 | 267
Marketable securities | 102,035 | 92,524
Interest and other receivables | 475 | 1,206
Prepaid assets | 524 | 647
Total current assets | 116,112 | 115,892
Noncurrent marketable securities | 13,954 | 32,661
Property and equipment, net | 183 | 207
Total assets | 130,249 | 148,760
Current liabilities: |  |
Accounts payable | 225 | 160
Accrued compensation and benefits | 2,843 | 3,026
Accrued collaboration charges | 3,367 | 2,328
Accrued liabilities | 1,434 | 1,120
Total current liabilities | 7,869 | 6,634
Commitments and contingencies |  |
Stockholders' equity: |  |
Preferred stock, $0.001 par value; 3,000,000 shares authorized; no shares issued and outstanding at December 31, 2016 and 2015 |  |
Common Stock, $0.001 par value; 300,000,000 shares authorized; 159,158,636 and 158,781,359 shares issued and outstanding at December 31, 2016 and 2015, respectively | 159 | 159
Additional paid-in capital | 1,080,198 | 1,070,567
Accumulated deficit | (957,924) | (928,387)
Accumulated other comprehensive loss | (53) | (213)
Total stockholders' equity | 122,380 | 142,126
Total liabilities and stockholders' equity | $ 130,249 | $ 148,760

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