Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000	100,000
Common stock, par value	$ 0.006	$ 0.006
Common stock, shares authorized	180,000,000	180,000,000
Common stock, shares issued	10,761,684	10,521,278
Common stock, shares outstanding	10,761,684	10,521,278
Series C Convertible Preferred Stock [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,200	1,200
Preferred stock, liquidation preference value	$ 5,100	$ 5,100
Preferred stock, shares issued	100	750
Preferred stock, shares outstanding	100	750
Series D Convertible Preferred Stock [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	220	220
Preferred stock, liquidation preference value	$ 300	$ 300
Preferred stock, shares issued	40	60
Preferred stock, shares outstanding	40	60
Series E Convertible Preferred Stock [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,500	3,500
Preferred stock, liquidation preference value	$ 5,000	$ 5,000
Preferred stock, shares issued	3,488	0
Preferred stock, shares outstanding	3,488	0
Series F Convertible Preferred Stock [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,200	2,200
Preferred stock, liquidation preference value	$ 5,000	$ 5,000
Preferred stock, shares issued	381	0
Preferred stock, shares outstanding	381	0