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CONDENSED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 8,199 $ 21,248
Restricted cash 267 267
Marketable securities 102,402 92,524
Interest and other receivables 586 1,206
Prepaid assets 248 647
Total current assets 111,702 115,892
Noncurrent marketable securities 25,523 32,661
Property and equipment, net 191 207
Total assets 137,416 148,760
Current liabilities:    
Accounts payable 235 160
Accrued compensation and benefits 2,311 2,974
Accrued collaboration charges 3,420 2,328
Accrued restructuring charges 19 52
Accrued liabilities 1,126 1,120
Total current liabilities 7,111 6,634
Commitments and contingencies
Stockholders' equity:    
Common stock 159 159
Additional paid-in capital 1,075,922 1,070,567
Accumulated deficit (945,866) (928,387)
Accumulated other comprehensive income (loss) 90 (213)
Total stockholders' equity 130,305 142,126
Total liabilities and stockholders' equity $ 137,416 $ 148,760