CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 7,611	$ 3,135
Investments available for sale	1,803	1,453
Accounts receivables	6	0
Prepaid expenses and other current assets	718	591
Total current assets	10,138	5,179
Prepaid expenses, non-current	1,604	1,989
Property and equipment, net	9	7
Total assets	11,751	7,175
Current liabilities:
Accounts payable and accrued liabilities	1,050	414
Accrued payroll and related expenses	277	2,175
Other liabilities, current	140	0
Income tax liability	396	393
Deferred revenue, current portion	0	1,500
Total current liabilities	1,863	4,482
Deferred revenue, non-current portion	0	1,000
Other liabilities	0	140
Total liabilities	1,863	5,622
Commitments and contingencies (Note 4)
Stockholders' equity:
Preferred stock, par value $0.0001 per share Authorized: 10,000,000 shares at December 31, 2018 and December 31, 2017, Issued and outstanding: 0 shares at December 31, 2018 and December 31, 2017	0	0
Common stock, par value $0.0001 per share Authorized: 100,000,000 shares at December 31, 2018 and December 31, 2017, Issued and outstanding: 66,879,847 shares and 59,051,978 shares, at December 31, 2018 and December 31, 2017, respectively	7	6
Additional paid-in capital	208,317	177,076
Accumulated deficit	(198,422)	(175,516)
Accumulated other comprehensive loss	(14)	(13)
Total stockholders' equity	9,888	1,553
Total liabilities and stockholders' equity	$ 11,751	$ 7,175