CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 8,726	$ 18,658
Investments available for sale	9,954	22,571
Prepaid expenses and other current assets	685	653
Total current assets	19,365	41,882
Prepaid expenses - non-current	2,759	3,144
Property and equipment, net	48	64
Total assets	22,172	45,090
Current liabilities:
Accounts payable and accrued liabilities	2,283	3,327
Royalty payable	0	6,100
Accrued payroll and related expenses	1,383	227
Related-party payable	11	81
Income tax liability	400	408
Deferred revenue, current portion	1,500	1,500
Derivative liability	0	320
Total current liabilities	5,577	11,963
Deferred revenue, non-current portion	$ 1,500	$ 500
Commitments and contingencies (Note 5)
Stockholders' equity:
Preferred stock, par value $0.0001 per share Authorized: 10,000,000 shares at December 31, 2015 and 2014, Issued and outstanding: 0 shares at December 31, 2015 and 2014	$ 0	$ 0
Common stock, par value $0.0001 per share Authorized: 100,000,000 shares at December 31, 2015 and 2014, Issued and outstanding: 53,198,835 shares and 51,996,701 shares, at December 31, 2015 and 2014, respectively	5	5
Additional paid-in capital	144,778	133,072
Accumulated deficit	(129,669)	(100,435)
Accumulated other comprehensive loss	(19)	(15)
Total stockholders' equity	15,095	32,627
Total liabilities and stockholders' equity	$ 22,172	$ 45,090