Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 12,383	$ 38,722
Prepaid interest, current portion	1,093	1,710
Prepaid expenses and other current assets	210	362
Total current assets	13,686	40,794
Property and equipment, net	1,022	1,039
Restricted cash	225	225
Prepaid interest, non-current portion	1,501	2,319
Total assets	16,434	44,377
Current liabilities:
Accounts payable	5,237	3,263
Accrued expenses	8,892	7,582
Common stock warrant liability		223
Total current liabilities	14,129	11,068
Long-term debt	25,000	25,000
Other liabilities	155	43
Total liabilities	39,284	36,111
Stockholders’ equity / (deficit):
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value; 60,000,000 shares authorized; 8,477,525 and 8,196,011 shares issued at September 30, 2016 and December 31, 2015, respectively; 8,476,033 and 8,194,519 shares outstanding at September 30, 2016 and December 31, 2015, respectively	8	8
Additional paid-in capital	592,262	590,490
Accumulated deficit	(612,066)	(579,178)
Treasury stock (at cost); 1,492 shares	(3,054)	(3,054)
Total stockholders’ (deficit) / equity	(22,850)	8,266
Total liabilities & stockholders’ equity	$ 16,434	$ 44,377