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CONDENSED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 12,802 $ 21,248
Restricted cash 267 267
Marketable securities 96,846 92,524
Interest and other receivables 624 1,206
Prepaid assets 416 647
Total current assets 110,955 115,892
Noncurrent marketable securities 31,976 32,661
Property and equipment, net 212 207
Total assets 143,143 148,760
Current liabilities:    
Accounts payable 396 160
Accrued compensation and benefits 1,619 2,974
Accrued collaboration charges 3,537 2,328
Accrued restructuring charges 35 52
Accrued liabilities 1,071 1,120
Total current liabilities $ 6,658 $ 6,634
Commitments and contingencies
Stockholders' equity:    
Common stock $ 159 $ 159
Additional paid-in capital 1,073,515 1,070,567
Accumulated deficit (937,229) (928,387)
Accumulated other comprehensive income (loss) 40 (213)
Total stockholders' equity 136,485 142,126
Total liabilities and stockholders' equity $ 143,143 $ 148,760