Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Balance Sheets [Abstract]
Property and equipment, accumulated depreciation	$ 455	$ 453
Unamortized deferred financing cost, net	63	90
Unamortized debt discount	993	1,267
Obligation under capital lease of current maturities	$ 10	$ 10
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	200,000,000	200,000,000
Common stock, issued	66,405,180	55,888,399
Common stock, outstanding	66,405,180	55,888,399