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Capital Structure (Tables)
3 Months Ended
Mar. 31, 2023
Stockholder's Equity  
Schedule of Series A Preferred Stock
A summary of the Company’s Series B Perpetual Non-Convertible Preferred Stock balance at March 31, 2023 and changes during the three months ended March 31, 2023, are presented below:
Series B Preferred Stock
SharesAmount
Balance at December 31, 202271 $68,348 
Amortization of preferred stock issuance costs— — 
Issuance of preferred PIK dividend— — 
Redemption of Series B preferred shares— — 
Balance at March 31, 20231
71 $68,348 
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1    Series B preferred stock net principal balance of $68.3 million is presented as gross principal balance of $70.7 million net of $2.35 million unamortized issuance costs.
Schedule of Stock-based Compensation
The following table summarizes stock-based compensation expense related to all of the Company’s stock awards included by operating expense categories, as follows:
Three Months Ended March 31,
20232022
Cost of revenues$224 $221 
Research and development542 556 
Selling, general and administrative973 1,150 
Total stock-based compensation expense$1,739 $1,927 

The following table summarizes stock-based compensation expense related to all of the Company’s stock awards included by award type, as follows:
Three Months Ended March 31,
20232022
Stock options$528 $794 
Restricted stock awards785 878 
Performance Based Cash Units426 255 
Total stock-based compensation before taxes$1,739 $1,927 
Tax benefit $345 $377 
Schedule of Fair Value Assumptions The weighted-average assumptions used in the Black-Scholes option pricing model are as follows: 
Three Months Ended March 31,
20232022
Expected stock price volatility72.5 %71.9 %
Risk-free interest rate4.3 %1.5 %
Expected life of options (in years)4.284.15
Expected dividend yield0.0 %0.0 %
Weighted-average fair value (PSV) of the options$0.60 $1.13 
Schedule of Information About Stock Options Outstanding
The following table summarizes information about stock options outstanding as of March 31, 2023:
OptionsNumber of
Options
Weighted-Average
Exercise Price
Weighted-Average
Remaining
Contractual
Term (Years)
Aggregate
Intrinsic
Value
Outstanding at December 31, 20226,641 $3.80 
Options Granted19 1.02 
Options Exercised— — 
Options Cancelled(160)8.04 
Outstanding at March 31, 20236,500 $3.69 5.07$
Vested and exercisable at March 31, 20232,635 $6.67 3.71$— 
Restricted stock awards  
Stockholder's Equity  
Summary of Unvested Restricted Stock and Performance Shares Activity
A summary of the Company’s unvested restricted stock at March 31, 2023, and changes during the three months ended March 31, 2023, is presented below:
Unvested Restricted StockNumber of
Awards
Weighted- Average
Grant Date
Fair Value
Unvested at December 31, 20224,385 $1.82 
Granted3,161 0.95 
Granted adjustment1
(395)3.25 
Vested(94)4.47 
Forfeited(71)2.32 
Unvested at March 31, 20236,986 $1.31 
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1    Represents performance based cash units grants that vested and were paid out in form of shares of stock during the period and changes in unvested performance based restricted stock awards due to performance adjustments.
Performance based cash units  
Stockholder's Equity  
Summary of Unvested Restricted Stock and Performance Shares Activity
A summary of the Company’s outstanding performance based cash units at March 31, 2023 and changes during the three months ended March 31, 2023, is presented below:
Outstanding Cash UnitsNumber of
Units
Period End Fair Value
Outstanding at December 31, 20225,872 $0.62 
Granted1,206 — 
Granted adjustment1
— — 
Vested and distributed2
— — 
Forfeited(56)— 
Outstanding at March 31, 20237,022 $0.94 
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1    Includes changes in the outstanding performance based cash units due to performance adjustments.
2    Includes earned PBCU that vested and were distributed to participants during the period.