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CONDENSED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 6,606 $ 12,810
Restricted cash 268 268
Marketable securities 88,239 102,035
Interest and other receivables 457 475
Litigation settlement insurance recovery 6,000  
Prepaid assets 496 524
Total current assets 102,066 116,112
Noncurrent marketable securities 22,076 13,954
Property and equipment, net 140 183
Total assets 124,282 130,249
Current liabilities:    
Accounts payable 205 225
Accrued compensation and benefits 2,056 2,843
Accrued collaboration charges 1,907 3,367
Litigation settlement payable 6,250  
Accrued liabilities 856 1,434
Total current liabilities 11,274 7,869
Commitments and contingencies
Stockholders' equity:    
Common stock 159 159
Additional paid-in capital 1,084,440 1,080,198
Accumulated deficit (971,512) (957,924)
Accumulated other comprehensive loss (79) (53)
Total stockholders' equity 113,008 122,380
Total liabilities and stockholders' equity $ 124,282 $ 130,249