CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 6,333	$ 7,015
Investments, at fair value	575	1,661
Accounts receivable, net	140	166
Prepaid expenses and other	249	245
Total current assets	7,297	9,087
Property and equipment, net	253	279
Other assets	97	97
Total assets	7,647	9,463
Current liabilities:
Accounts payable	1,135	1,096
Accrued expenses and other	399	598
Total current liabilities	1,534	1,694
Other liabilities	86	89
Total liabilities	$ 1,620	$ 1,783
Stockholders' equity:
Preferred stock, $0.001 par value, 5,000 shares authorized; none issued and outstanding in at March 31, 2016 and 2015
Common stock, $0.001 par value; 55,000 shares authorized; 17,264 shares issued and outstanding at March 31, 2016 and December 31, 2015	$ 17	$ 17
Additional paid-in capital	292,710	292,508
Accumulated other comprehensive loss		(5)
Accumulated deficit	(286,700)	(284,840)
Total stockholders' equity	6,027	7,680
Total liabilities and stockholders' equity	$ 7,647	$ 9,463