CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,647	$ 6,627
Investments available for sale	2,665	9,249
Prepaid expenses and other current assets	692	588
Total current assets	5,004	16,464
Prepaid expenses, non-current	2,086	2,374
Property and equipment, net	12	33
Total assets	7,102	18,871
Current liabilities:
Accounts payable and accrued liabilities	802	1,806
Accrued payroll and related expenses	210	1,522
Income tax liability	394	396
Other current liabilities	140	0
Deferred revenue, current portion	1,500	1,500
Total current liabilities	3,046	5,224
Deferred revenue, non-current portion	1,375	2,500
Total liabilities	4,421	7,724
Commitments and contingencies (Note 4)
Stockholders' equity:
Preferred stock, par value $0.0001 per share Authorized: 10,000,000 shares at September 30, 2017 and December 31, 2016, Issued and outstanding: 0 shares at September 30, 2017 and December 31, 2016	0	0
Common stock, par value $0.0001 per share Authorized: 100,000,000 shares at September 30, 2017 and December 31, 2016, Issued and outstanding: 58,309,034 shares and 58,144,888 shares, at September 30, 2017 and December 31, 2016, respectively	6	6
Additional paid-in capital	172,171	169,391
Accumulated deficit	(169,482)	(158,238)
Accumulated other comprehensive loss	(14)	(12)
Total stockholders' equity	2,681	11,147
Total liabilities and stockholders' equity	$ 7,102	$ 18,871