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Stock Compensation (Tables)
3 Months Ended
Mar. 31, 2023
Share-based Payment Arrangement [Abstract]  
Schedule of Weighted-Average Assumptions Used to Determine the Fair Value of Options
The following weighted-average assumptions were used to determine the fair value of options and shares purchased under the ESPP:
Three Months Ended
March 31, 2023
Stock OptionsESPP
Expected lifeN/A0.5 Years
Expected stock price volatilityN/A0.66
Risk-free interest rateN/A4.77%
Summary of Total Stock Compensation Expenses
The following table summarizes total stock compensation expenses prior to the capitalization of amounts into Deferred preservation and Inventory costs (in thousands):
Three Months Ended
March 31,
20232022
RSA, RSU, and PSU expense$2,641 $2,768 
Stock option and ESPP expense872 572 
Total stock compensation expense$3,513 $3,340