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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