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Stockholders' Equity
 12 Months Ended
Dec. 31, 2023
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Stockholders’ Equity
Warrants

A summary of warrant activity and changes in warrants outstanding, including both liability and equity classifications, is presented below:

 Number of
Warrants		Weighted-Average
Exercise Price
Per Share		Weighted-Average Remaining Contractual Term
Balance outstanding, December 31, 20214,490,159 $5.80 3.0 years
Expired(129,191)$21.60 
Balance outstanding, December 31, 20224,360,968 $5.33 2.1 years
Expired(1,553,020)$10.54 
Balance outstanding, December 31, 20232,807,948 $2.45 1.9 years

Series A Convertible Preferred Stock

The material terms of the Series A Convertible Preferred Stock consist of:

1)Dividends. Holders of the Company’s Series A Convertible Preferred Stock are entitled to receive cumulative dividends at the rate per share of 4% per annum, payable quarterly on March 31, June 30, September 30 and December 31, beginning with September 30, 2005. Dividends are payable, at the Company’s sole election, in cash or shares of common stock. As of December 31, 2023 and 2022, the Company had $462,000 and $438,000, respectively in cumulative unpaid preferred stock dividends, included in the liquidation preference of the Series A Convertible Preferred Stock, and $24,000 and $24,000 of cumulative dividends were added to the liquidation preference of the Series A Convertible Preferred Stock during the years ended December 31, 2023 and 2022, respectively.

2)Voting Rights. Shares of the Series A Convertible Preferred Stock have no voting rights. However, so long as any shares of Series A Convertible Preferred Stock are outstanding, the Company may not, without the affirmative vote of the holders of the shares of Series A Convertible Preferred Stock then outstanding, (a) adversely change the powers, preferences or rights given to the Series A Convertible Preferred Stock, (b) authorize or create any class of stock senior or equal to the Series A Convertible Preferred Stock, (c) amend its certificate of incorporation or other charter documents, so as to affect adversely any rights of the holders of Series A Convertible Preferred Stock or (d) increase the authorized number of shares of Series A Convertible Preferred Stock.

3)Liquidation. Upon any liquidation, dissolution or winding-up of the Company, the holders of the Series A Convertible Preferred Stock are entitled to receive an amount equal to the Stated Value per share, which is currently $10 per share plus any accrued and unpaid dividends.

4)Conversion Rights. Each share of Series A Convertible Preferred Stock is convertible at the option of the holder into that number of shares of common stock determined by dividing the Stated Value, currently $10 per share, by the conversion price, which at the time of issuance was $928.80 per share, and subsequently adjusted to $691.20 per share.

5)Subsequent Equity Sales. The conversion price is subject to adjustment for dilutive issuances for a period of 12 months beginning March 17, 2006 and the conversion price was adjusted to $691.20 per share.

6) Automatic Conversion. If the price of the Company’s common stock equals $1,857.60 per share for 20 consecutive trading days, and an average of 116 shares of common stock per day are traded during the 20 trading days, the Company will have the right to deliver a notice to the holders of the Series A Convertible Preferred Stock, requesting the holders to convert any portion of the shares of Series A Convertible Preferred Stock into shares of common stock at the applicable conversion price. As of the date of these financial statements, such conditions have not been met.

The components of the liquidation preference for the Series A Convertible Preferred Stock were as follows:
 As of December 31,
(in thousands)20232022
Stated Value per share liquidation$606 $606 
Cumulative unpaid preferred stock dividends462 438 
Liquidation preference - Series A Convertible Preferred Stock$1,068 $1,044