Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 23,052	$ 35,808
Investment securities	17,929	21,481
Prepaid expenses and other current assets	1,271	1,114
Total current assets	42,252	58,403
Property and equipment, net	226	188
In-process research and development	8,549	8,549
Goodwill	3,007	3,007
Other assets	183	353
Total assets	54,217	70,500
Current liabilities:
Accounts payable	2,600	1,370
Accrued liabilities	8,152	5,625
Accrued compensation and payroll taxes	1,430	1,443
Debt facility	10,991
Total current liabilities	23,173	8,438
Long-term lease obligation	25
Debt facility, net of current portion	3,726
Deferred income tax liability	3,404	3,404
Total liabilities	$ 30,328	$ 11,842
Commitments (Note 12)
Stockholders' equity:
Common stock, $0.001 par value; 500,000,000 shares authorized; 163,614,297 and 159,458,376 shares issued and outstanding at December 31, 2015 and 2014, respectively	$ 164	$ 159
Additional paid-in capital	298,715	293,655
Accumulated other comprehensive loss	(17)	(25)
Accumulated deficit	(274,973)	(235,131)
Total stockholders' equity	23,889	58,658
Total liabilities and stockholders' equity	$ 54,217	$ 70,500