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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 9,269 $ 8,726
Investments available for sale 8,599 9,954
Prepaid expenses and other current assets 919 685
Total current assets 18,787 19,365
Prepaid expenses - non-current 2,663 2,759
Property and equipment, net 44 48
Total assets 21,494 22,172
Current liabilities:    
Accounts payable and accrued liabilities 3,926 2,283
Accrued payroll and related expenses 0 1,383
Related-party payable 0 11
Income tax liability 400 400
Deferred revenue, current portion 1,500 1,500
Total current liabilities 5,826 5,577
Deferred revenue, non-current portion $ 1,125 $ 1,500
Commitments and contingencies (Note 4)
Stockholders' equity:    
Preferred stock, par value $0.0001 per share Authorized: 10,000,000 shares at March 31, 2016 and December 31, 2015, Issued and outstanding: 0 shares at March 31, 2016 and December 31, 2015 $ 0 $ 0
Common stock, par value $0.0001 per share Authorized: 100,000,000 shares at March 31, 2016 and December 31, 2015, Issued and outstanding: 54,889,855 shares and 53,198,835 shares, at March 31, 2016 and December 31, 2015, respectively 5 5
Additional paid-in capital 152,827 144,778
Accumulated deficit (138,279) (129,669)
Accumulated other comprehensive loss (10) (19)
Total stockholders' equity 14,543 15,095
Total liabilities and stockholders' equity $ 21,494 $ 22,172