CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Preferred stock, convertible, shares authorized (in shares)	5,000,000
Common stock, 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)	5,316,828	5,266,828
Common stock, shares outstanding (in shares)	5,211,543	5,161,543
Treasury stock, shares (in shares)	105,285	105,285
Series A-2 Preferred Stock
Preferred stock, convertible, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, convertible, stated value	$ 7,500	$ 7,500
Preferred stock, convertible, shares authorized (in shares)	7,500	7,500
Preferred stock, convertible, shares issued (in shares)	45	32
Preferred stock, convertible, shares outstanding (in shares)	45	32
Preferred stock, convertible, liquidation value	$ 336,000	$ 237,000
Series C Preferred Stock
Preferred stock, convertible, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, convertible, stated value	$ 1,000	$ 1,000
Preferred stock, convertible, shares authorized (in shares)	1,750.00	1,750
Preferred stock, convertible, shares issued (in shares)	325	475
Preferred stock, convertible, shares outstanding (in shares)	325	475
Preferred stock, convertible, liquidation value	$ 325,000	$ 475,000
Series D Preferred Stock
Preferred stock, convertible, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, convertible, stated value	$ 28.50	$ 28.50
Preferred stock, convertible, shares authorized (in shares)	1,750,000	1,750,000
Preferred stock, convertible, shares issued (in shares)	1,720,460	1,734,901
Preferred stock, convertible, shares outstanding (in shares)	1,720,460	1,734,901
Preferred stock, convertible, liquidation value	$ 49,163,000	$ 49,445,000
Series E Preferred Stock
Preferred stock, convertible, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, convertible, stated value	$ 28.50	$ 28.50
Preferred stock, convertible, shares authorized (in shares)	175,000	175,000
Preferred stock, convertible, shares issued (in shares)	131,579	131,579
Preferred stock, convertible, shares outstanding (in shares)	131,579	131,579
Preferred stock, convertible, liquidation value	$ 3,750,000	$ 3,750,000

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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