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CONDENSED BALANCE SHEETS - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 5,883 | $ 21,248
Restricted cash | 268 | 267
Marketable securities | 102,655 | 92,524
Interest and other receivables | 5,404 | 1,206
Prepaid assets | 846 | 647
Total current assets | 115,056 | 115,892
Noncurrent marketable securities | 21,005 | 32,661
Property and equipment, net | 170 | 207
Total assets | 136,231 | 148,760
Current liabilities: |  |
Accounts payable | 271 | 160
Accrued compensation and benefits | 2,205 | 2,974
Accrued collaboration charges | 3,398 | 2,328
Accrued restructuring charges | 13 | 52
Accrued liabilities | 1,432 | 1,120
Total current liabilities | 7,319 | 6,634
Commitments and contingencies |  |
Stockholders' equity: |  |
Common stock | 159 | 159
Additional paid-in capital | 1,078,170 | 1,070,567
Accumulated deficit | (949,442) | (928,387)
Accumulated other comprehensive income (loss) | 25 | (213)
Total stockholders' equity | 128,912 | 142,126
Total liabilities and stockholders' equity | $ 136,231 | $ 148,760

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