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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 3,135 $ 7,611
Investments available for sale 2,394 1,803
Accounts receivables 5 6
Prepaid expenses and other current assets 237 718
Total current assets 5,771 10,138
us-gaap_PrepaidExpenseAndOtherAssetsNoncurrent 1,711 1,604
Property and equipment, net 16 9
Total assets 7,498 11,751
Current liabilities:    
Accounts payable and accrued liabilities 1,346 1,050
Accrued payroll and related expenses 287 277
Other current liabilities 193 140
Income tax liability 0 396
Total current liabilities 1,826 1,863
Other liabilities 44 0
Total liabilities 1,870 1,863
Commitments and contingencies (Note 4)
Stockholders' equity:    
Preferred stock, par value $0.0001 per share Authorized: 10,000,000 shares at December 31, 2019 and December 31, 2018, Issued and outstanding: 0 shares at December 31, 2019 and December 31, 2018 0 0
Common stock, par value $0.0001 per share Authorized: 100,000,000 shares at December 31, 2019 and December 31, 2018, Issued and outstanding: 69,586,764 shares and 66,879,847 shares, at December 31, 2019 and December 31, 2018, respectively 7 7
Additional paid-in capital 223,237 208,317
Accumulated deficit (217,602) (198,422)
Accumulated other comprehensive loss (14) (14)
Total stockholders' equity 5,628 9,888
Total liabilities and stockholders' equity $ 7,498 $ 11,751