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CONDENSED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 14,861 $ 12,810
Restricted cash 268 268
Marketable securities 84,432 102,035
Interest and other receivables 597 475
Litigation settlement insurance recovery 6,000  
Prepaid assets 405 524
Total current assets 106,563 116,112
Noncurrent marketable securities 22,126 13,954
Property and equipment, net 158 183
Total assets 128,847 130,249
Current liabilities:    
Accounts payable 308 225
Accrued compensation and benefits 1,489 2,843
Accrued collaboration charges 2,495 3,367
Litigation settlement payable 6,250  
Accrued liabilities 1,054 1,434
Total current liabilities 11,596 7,869
Commitments and contingencies
Stockholders' equity:    
Common stock 159 159
Additional paid-in capital 1,082,270 1,080,198
Accumulated deficit (965,107) (957,924)
Accumulated other comprehensive loss (71) (53)
Total stockholders' equity 117,251 122,380
Total liabilities and stockholders' equity $ 128,847 $ 130,249