CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 8,527	$ 8,726
Investments available for sale	9,243	9,954
Prepaid expenses and other current assets	706	685
Total current assets	18,476	19,365
Prepaid expenses, non-current	2,470	2,759
Property and equipment, net	40	48
Total assets	20,986	22,172
Current liabilities:
Accounts payable and accrued liabilities	2,832	2,283
Accrued payroll and related expenses	0	1,383
Royalty payable	884	0
Related-party payable	94	11
Income tax liability	400	400
Deferred revenue, current portion	1,500	1,500
Total current liabilities	5,710	5,577
Deferred revenue, non-current portion	2,875	1,500
Commitments and contingencies (Note 4)
Stockholders' equity:
Preferred stock, par value $0.0001 per share Authorized: 10,000,000 shares at September 30, 2016 and December 31, 2015, Issued and outstanding: 0 shares at September 30, 2016 and December 31, 2015	0	0
Common stock, par value $0.0001 per share Authorized: 100,000,000 shares at September 30, 2016 and December 31, 2015, Issued and outstanding: 56,689,167 shares and 53,198,835 shares, at September 30, 2016 and December 31, 2015, respectively	6	5
Additional paid-in capital	163,402	144,778
Accumulated deficit	(151,004)	(129,669)
Accumulated other comprehensive loss	(3)	(19)
Total stockholders' equity	12,401	15,095
Total liabilities and stockholders' equity	$ 20,986	$ 22,172