CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Preferred stock, convertible, par value (in dollars per share)	$ 0.0001
Preferred stock, shares authorized (in shares)	1,938,250
Preferred stock, shares issued (in shares)	1,829,582
Preferred stock, shares outstanding (in shares)	1,829,582
Common Stock, convertible, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common Stock, shares authorized (in shares)	150,000,000	150,000,000
Common Stock, shares issued (in shares)	7,861,912	5,266,800
Common Stock, shares outstanding (in shares)	7,748,629	5,161,500
Treasury stock (in shares)	113,300	105,300
Series A-2 Preferred Stock
Preferred stock, convertible, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, stated value	$ 7,500	$ 7,500
Preferred stock, shares authorized (in shares)	7,500	7,500
Preferred stock, shares issued (in shares)	45	32
Preferred stock, shares outstanding (in shares)	45	32
Preferred stock, liquidation value	$ 338,000	$ 237,000
Series C Preferred Stock
Preferred stock, convertible, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, stated value	$ 1,000	$ 1,000
Preferred stock, shares authorized (in shares)	1,750	1,750
Preferred stock, shares issued (in shares)	0	475
Preferred stock, shares outstanding (in shares)	0	475
Preferred stock, liquidation value	$ 0	$ 475,000
Series D Preferred Stock
Preferred stock, convertible, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, stated value	$ 28.50	$ 28.50
Preferred stock, shares authorized (in shares)	1,750,000	1,750,000
Preferred stock, shares issued (in shares)	1,697,958	1,734,901
Preferred stock, shares outstanding (in shares)	1,697,958	1,734,901
Preferred stock, liquidation value	$ 48,392,000	$ 49,445,000
Series E Preferred Stock
Preferred stock, convertible, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, stated value	$ 28.50	$ 28.50
Preferred stock, shares authorized (in shares)	175,000	175,000
Preferred stock, shares issued (in shares)	131,579	131,579
Preferred stock, shares outstanding (in shares)	131,579	131,579
Preferred stock, liquidation value	$ 3,750,000	$ 3,750,000