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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2023
Stockholders' Equity Note [Abstract]  
Summary of Warrant Activity and Changes in Warrants Outstanding
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
Schedule of Preferred Stock
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