CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 16,899	$ 15,267
Marketable securities-short term	14,108	15,859
Prepaid expenses and other current assets	421	822
Total current assets	31,428	31,948
Property and equipment, net	142	180
Other assets	204	252
Total assets	31,774	32,380
Current liabilities:
Accounts payable and accrued expenses	7,261	8,700
Total current liabilities	7,261	8,700
Long-term liabilities:
Notes payable	14,427
Total liabilities	21,688	8,700
Commitment and contingencies
Preferred stock, $0.01 par value; 1,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.01 par value; 100,000,000 shares authorized; 71,171,551 and 71,146,209 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	711	711
Additional paid-in capital	528,994	527,802
Accumulated other comprehensive income (loss)	(7)	2
Accumulated deficit	(519,612)	(504,835)
Total stockholders' equity	10,086	23,680
Total liabilities and stockholders' equity	$ 31,774	$ 32,380