Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 32,777	$ 14,435
Short-term investments	0	70,513
Prepaid expenses and other assets	1,099	3,135
Total current assets	33,876	88,083
Property and equipment, net		763
Other assets	10	264
Total assets	33,886	89,110
Current liabilities:
Accounts payable and accrued expenses	1,108	6,534
Accrued restructuring charges	1,201
Accrued interest		71
Current portion of long-term obligations		1
Total current liabilities	2,309	6,606
Long-term obligations, net of discount		10,102
Non-current liabilities	$ 24	$ 298
Commitments and contingencies (Note 4)
Stockholders' equity:
Preferred stock, $0.001 par value; authorized shares-10,000,000 at December 31, 2015 and 2014; no shares issued and outstanding
Common stock, $0.001 par value; authorized shares-200,000,000 at December 31, 2015 and 2014; issued and outstanding-1,596,953 and 1,566,045 at December 31, 2015 and 2014, respectively	$ 2	$ 2
Additional paid-in capital	222,403	218,549
Accumulated other comprehensive (loss) income		(8)
Accumulated deficit	(190,852)	(146,439)
Total stockholders' equity	31,553	72,104
Total liabilities and stockholders' equity	$ 33,886	$ 89,110